Free Online Sudoku and Other Puzzles

Appearance:

Cell with a mine
Cell with a two mines
Cell with a buoy (neighbouring four mines)
Cell on which there is certainly no mine. Marking cells without a mine with a cross is optional.

Solve puzzles:

Left-click: Changes the cell content: cross, one mine, two mines, empty cell.
Left-drag: Copies the cell content: cross, one mine, two mines, empty cell.
Rigt-click: Dropdown menu → Markers.
Tap: Changes the cell content: cross, one mine, two mines, empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: cross, one mine, two mines, empty cell.
Shift+Arrow Keys: Copies the cell content: cross, one mine, two mines, empty cell.

Select a value directly with one of the following keys:

Value	Keys
One mine	`A`, `.`, `O`
Two mines	`2`
Cross	`S`, `,`, `X`
Emty cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell content: ?, x, L, I, T, S, empty cell.
Left-drag: Copies the cell content: ?, x, L, I, T, S, empty cell.
Tap: Changes the cell content: ?, x, L, I, T, S, empty cell.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: black circle, white circle, empty cell.
Shift+Arrow Keys: Copies the cell content: black circle, white circle, empty cell.

Select a symbol directly with one of the following keys:

Symbol	Keys
L	`L`
I	`I`
T	`T`
S	`S`
?	`?`, `O`, `A`, `Ins`
x	`X`
Empty cell	`Space` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white or black circles form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell content: black division, cross, neutral.
Left-drag: Copies the cell content.
Right-click: Dropdown menu → Markers.
Tap: Changes the cell content:: black division, cross, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: black division, cross, neutral.
Shift+Arrow Keys: Copies the cell content.

Select a colour directly with one of the following keys:

Colour	Keys
Black division	`A`, `.`
Cross	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the black cells do not form a single orthogonally contiguous area, each sub-area is coloured differently.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Selects values in sequence (→, ↑, ↓, ←, empty cell).
Right-click: Dropdown menu → Values.
Tap: Selects values in sequence (→, ↑, ↓, ←, empty cell)..
Hold: Dropdown menu → Values.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the value of the cell: Selects values in sequence (→, ↑, ↓, ←, empty cell)..

Select a value directly with one of the following keys:

Value	Keys
↑	`N`
↓	`S`
←	`W`
→	`E`
Emty cell	`/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with a star.
A cell on which there is certainly no lamp. Marking cells without a lamp with a cross is optional.
Illuminated cells are shown in yellow; non-illuminated cells are shown in white.

Solve puzzles:

Left-click: Changes the value of the cell: star, cross, or empty cell.
Tap: Changes the value of the cell: lamp, cross, or empty cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral.

Select a value directly with one of the following keys:

Value	Keys
Star	`A`, `.`, `O`
Cross	`S`, `,`, `X`
Emty cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white cells form several disjoint areas, each area is displayed in a different colour.
Neighbouring black cells are marked with a red dot.
If the path between two circle cells does not turn orthogonally at least twice, the affected circles are circled in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers/letters (which cannot be changed) are shown in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).

Solve puzzles:

Left-click (cell): Dropdown menu → Values.
Left-click (line): Border → Cross → Grid.
Left-drag (cells): Copy value.
Left-drag (lines): Copy line.
Right-click (cell): Dropdown menu → Markers.
Tap (cell): Dropdown menu → Values.
Tap (line): Border → Cross → Grid.
Drag (cells): Copy value.
Drag (lines): Copy line.
Hold (cell): Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow keys: Copies the value of the cell.
Delete or Backspace key: Empty cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Clear cell	`0`, `X`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.
The line display has no influence on the solution; only the values of the cells count for the solution.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

An arrow stands alone.
A cross marks a field that definitely does not contain an arrow.
A circle a field that definitely contains an arrow, but whose orientation is still unknown.

Solve puzzles:

Left-click: Dropdown menu → Select the desired arrows, cross, or circle.
Rigt-click: Dropdown menu → Markers.
Tap: Dropdown menu → Select the desired arrows, cross, or question circle.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: desired arrows, cross, or circle.
Shift+Arrow Keys: Copies the cell content.

Select a symbol directly with one of the following keys:

Symbol	Keys
Arrows	`N`, `S`, `W`, `E`
Circle	`?`, `.`, `O`
Cross	`X`, `,`
Empty cell	`/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white or black circles form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with a star.
Cell with a sun.
Cell with a moon.
Cell that is known not to contain a tent. Marking cells without a tree with a cross is optional.

Solve puzzles:

Left-click: Changes the cell content: cross, star, sun, moonor empty cell.
Left-drag: Copies the cell content: cross, star, sun, moonor empty cell.
Rigt-click: Dropdown menu → Markers.
Tap: Changes the cell content: tent, cross, or empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: cross, star, sun, moonor empty cell.
Shift+Arrow Keys: Copies the cell content: cross, star, sun, moonor empty cell.

Select a colour directly with one of the following keys:

Colour	Keys
Star	`S`, `*`
Sun	`O`, `U`
Moon	`M`, `.`
Cross	`,`, `X`
Empty cell	`-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Coloured letters are predefined and cannot be changed..
Black letters are those you have entered.

Solve puzzles:

Left-click: Empty → A → B → C → empty.
Left-drag: Copies the cell content.
Rigt-click: Dropdown menu → Markers, colours.
Tap: Empty → A → B → C → empty.
Drag: Copies the cell content.
Hold: Dropdown menu → Markers, colours.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Empty → A → B → C → empty.
Shift+Arrow Keys: Copies the cell content.

Select a colour directly with one of the following keys:

Letter	Keys
A	`A`
B	`B`
C	`C`
Neutral	`X`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red. If the white cells form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

A circle indicates a field through which a line must run, but the exact course of the line has not yet been determined
A cross indicates a field through which no line will pass.

Solve puzzles:

Left-click: Dot→circle→empty cell.
Left-drag: The line follows the movement of the mouse pointer.
Rigt-click: Dropdown menu → Markers.
Rigt-drag: Deletes the cells under the mouse pointer.
Tap: Dot→Circle→empty cell.
Drag: The line follows the movement of the finger.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow Keys: The line follows the movement of the selection frame.
Enter, Spacebar, Ins: Dot→Circle→empty cell.
Del, Backspace: Empty the cell.

Change the cell directly with one of the following keys::

Value	Keys
Circle	`S`, `.`, `O`
Cross	`A`, `,`, `X`
Empty cell	`D`,, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

The default ship parts that cannot be changed are shown in blue, and the ship parts that you have entered are shown in black.

Solve puzzles:

Left-click: Dropdown menu → Select the desired ship part, cross, or square.
Left-drag: Copies the cell content.
Rigt-click: Dropdown menu → Markers.
Tap: Dropdown menu → Select the desired ship part, cross, or square.
Drag: Copies the cell content.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: desired ship part, cross, or square.
Shift+Arrow Keys: Copies the cell content.

Select a symbol directly with one of the following keys:

Symbol	Keys
Ship part	`N`, `S`, `W`, `E`, `M`, `O`
Ship (square)	`?`, `.`, `#`
Water (cross)	`X`, `,`
Empty cell	`/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white or black circles form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Dark-coloured symbols are predefined and cannot be changed.
Light-coloured symbols are the ones you have entered.

Solve puzzles:

Left-click: Changes the cell content: empty → circle → square → triangle → empty.
Left-drag: Copies the cell content.
Rigt-click: Dropdown menu → Markers, colours.
Tap: Change the cell content: empty → circle → square → triangle → empty.
Drag: Dropdown menu → Markers, colours..
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: empty → circle → square → triangle → empty.
Shift+Arrow Keys: Copies the cell content.

Select a symbol directly with one of the following keys:

Symbol	Keys
Circle	`K` ,`C`
Square	`Q`, `S`
Triangle	`D`, `T`
Empty cell	`X`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

or F7 key turn the candidate mode on and off again. In candidate mode, the list of values that a cell can take on is edited.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white or black circles form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell (Mirror /, mirror \, cross or empty).
Right-click: Dropdown menu → Changes the cell.
Tap: Changes the cell (Mirror /, mirror \, cross or empty).
Hold: Dropdown menu → Changes the cel.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell (Mirror /, mirror \, cross or empty).
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Mirror /	`/`, `A`
Mirror \	`\`, `S`
Cross	`X`, `D`, `,`
Clear cell	`-` , `/`, `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

The dropdown menu contains the symbol "🅇" (clear cell).
"■" means "certainly not a number".
"O" means "certainly a number, but this is not yet known".

Solve puzzles:

Left-click: Dropdown menu → Values.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Values.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Empty→O→■→Empty.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
■	`X`, `,`
O	`O`, `.`
Clear cell	`-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Correct rectangles are coloured lavender; incorrect or incomplete rectangles are coloured pink.
If you are working with colours, the rectangles are not shaded with the colour you have selected.
The cell that defines the first corner of a rectangle is drawn in light green.

Solve puzzles:

Click with the left mouse button on two diagonally opposite corner cells of the rectangle to be drawn.
Drag the left mouse button from one corner cell to the diagonally opposite corner cell.
Delete a rectangle by drawing it again.
Touch two diagonally opposite corner cells of the rectangle to be drawn.
Touch a corner cell and drag your finger to the diagonally opposite corner cell.
Delete a rectangle by drawing it again.
Use the arrow keys to move the selection frame to a cell, and:
Press Enter or Spacebar on a corner field of the rectangle to be drawn and then on the diagonally opposite corner field.
Press Shift and use the Arrow keys to move the selection frame to the diagonally opposite corner box.
Press Delete or Backspace over any cell of a rectangle to delete it.

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.
The line display has no influence on the solution; only the values of the cells count for the solution.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers/letters (which cannot be changed) are shown in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).
When an area is completed, it is automatically coloured grey - regardless of whether it was previously uncoloured or coloured.
If two areas meet, a border line is automatically drawn between these areas.

Solve puzzles:

Left-click (cell): Dropdown menu → Values.
Left-click (line): Border → Cross → Grid.
Left-drag (cells): Copy value.
Left-drag (lines): Copy line.
Right-click (cell): Dropdown menu → Markers.
Tap (cell): Dropdown menu → Values.
Tap (line): Border → Cross → Grid.
Drag (cells): Copy value.
Drag (lines): Copy line.
Hold (cell): Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow keys: Copies the value of the cell.
Delete or Backspace key: Empty cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Clear cell	`0`, `X`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.
The line display has no influence on the solution; only the values of the cells count for the solution.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with a lighthouse (illuminating four ships).
Cell with a ship.
Cell on which there is certainly no ship. Marking cells without a lamp with a cross is optional.

Solve puzzles:

Left-click: Changes the value of the cell (ship, cross, empty).
Left-drag: Copies the the value of the cell (ship, cross, empty).
Rigt-click: Dropdown menu → Markers.
Tap: Changes the value of the cell (ship, cross, empty).
Drag: Copies the the value of the cell (ship, cross, empty).
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the value of the cell (ship, cross, empty).
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Value	Keys
Ship	`A`, `.`, `O`
Cross	`S`, `,`, `X`
Empty cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Zombie
Ghost
Vampire
The dropdown menu contains the symbol "🅇" (clear cell).

Solve puzzles:

Left-click: Changes the value of the cell: zombie, ghost, vampire, or empty cell.
Right-click: Dropdown menu → Values.
Tap: Changes the value of the cell: zombie, ghost, vampire, or empty cell.
Hold: Dropdown menu → Values.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the value of the cell: zombie, ghost, vampire, or empty cell.

Select a value directly with one of the following keys:

Value	Keys
Zombie	`Z`
Ghost	`V`
Vampire	`G`
Emty cell	`/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

A cell can have the following values (regardless of the cell markers):

Be empty.
One of the four triangles: ◢, ◣, ◤ or ◥.
A small circle indicates that the cell certainly contains a triangle, but it is not yet clear which of the possible triangles.
A cross, which indicates that the cell certainly does not contain a triangle.

Solve puzzles:

Left-click: ● → ◢ → ◣ → ◤ → ◥ → ⤫ → Empty.
Right-click: Dropdown menu → Values.
Tap: ● → ◢ → ◣ → ◤ → ◥ → ⤫ → Empty..
Hold: Dropdown menu → Values.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: ● → ◢ → ◣ → ◤ → ◥ → ⤫ → Empty.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value		Keys
Triangle	◤ ◥	`7`, `9`
Circle	●	`5`
Triangle	◣ ◢	`1`, `3`
Cross	⤫	`S` `,` `X`
Clear cell		`D`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell (/, \, empty).
Right-click: Dropdown menu → Markers.
Tap: Changes the cell (/, \, empty).
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell (/, \, empty).
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Line /	`/`, `,`
Linie \	`\`, `.`
Clear cell	`-`, `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell (|, —, empty).
Left-drag: The line follows the movement of the mouse pointer.
Right-click: Dropdown menu → Markers.
Right-drag: Deletes the cells under the mouse pointer.
Tap: Changes the cell (|, —, empty).
Drag: The line follows the movement of the mouse pointer.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell (|, —, empty).
Shift+Arrow keys: The line follows the movement of the selection frame.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
—	`A`, `.`, `H`
\|	`S`, `,`, `V`
Clear cell	`D`, `-` , `/`, `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cells within the loop are coloured.
The dropdown cells outside the loop are marked with a cross.
It is not known whether cells without markings are inside or outside the loop.
"Lines on the loop are shown in bold, lines not on the circular route are marked with a cross.
For lines without markings, it is not known whether they are on the loop or not.

Solve puzzles:

Left-click (cell): Inside → Outside → Unknown
Left-click (line): Loop → Cross → Grid
Left-click-drag (cell): Copy
Left-drag (lines): Copy
Right-click (cell): → Markers
Tap (cell): Inside → Outside → Unknown
Tap (line): Loop → Cross → Grid
Drag (cell): Copy
Drag (lines): Copy
Hold (field): Dropdown menu → Markers
Arrow keys: move the selection frame
Enter, Spacebar, Ins: Inside → Outside → Unknown
Del, Backspase, ,, -, X: Empty cell
Shift+Arrow keys: Copy

Change the value directly with one of the following keys:

Cell	Keys
Outside	`,`, `X`
Inside	`.`, `O`
Unknown	`/`, `Del`, `Backspace`

Change the value directly with one of the following keys:

Line	Keys
Up	`D`
Left	`W`
Right	`E`
Bottom	`S`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

The numbers that are surrounded by an incorrect number of lines are circled in red.
If there are several partial lines, each individual partial line is displayed in a different colour. However, there are only 10 colours; a colour can therefore be used several times.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cells within the loop are coloured.
The dropdown cells outside the loop are marked with a cross.
It is unknown whether cells without markings are inside or outside the loop.
Lines on the loop are shown in bold, lines not on the circular route are marked with a cross.
For lines without markings, it is not known whether they are on the loop or not.

Solve puzzles:

Left-click (cell): Inside → Outside → Unknown
Left-click (line): Loop → Cross → Grid
Left-click-drag (cell): Copy
Left-drag (lines): Copy
Right-click (cell): → Markers
Tap (cell): Inside → Outside → Unknown
Tap (line): Loop → Cross → Grid
Drag (cell): Copy
Drag (lines): Copy
Hold (field): Dropdown menu → Markers
Arrow keys: move the selection frame
Enter, Spacebar, Ins: Inside → Outside → Unknown
Del, Backspase, ,, -, X: Empty cell
Shift+Arrow keys: Copy

Change the value directly with one of the following keys:

Cell	Keys
Outside	`,`, `X`
Inside	`.`, `O`
Unknown	`/`, `Del`, `Backspace`

Change the value directly with one of the following keys:

Line	Keys
Up	`D`
Left	`W`
Right	`E`
Bottom	`S`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Click repeatedly on a thin grid line between two number cells; left-click for horizontal lines, right-click for vertical lines.
Drag a line from one number cell to another number cell in the same row/column.
Drag a line from one number cell to another number cell in the same row/column.
Move the selection frame to a thin grid line between two number cells and repeatedly press the Enter key for horizontal lines or the Spacebar for vertical lines.
You can also draw a line directly: 1, 2 for horizontal lines; A, B for vertical lines. Del deletes a line.

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers (which cannot be changed) are shown in in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).

Solve puzzles:

Left-click: Dropdown menu → Values.
Left-drag: Neighbouring cell = cell + 1.
Right-click: Dropdown menu → Markers.
Right-drag: Neighbouring cell = cell - 1.
Tap: Dropdown menu → Values.
Drag: Neighbouring cell = cell + 1.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow keys: Neighbouring cell = cell + 1.
Ctrl+Shift+Arrow keys: Neighbouring field = cell - 1.
Enter, Spacebar, Ins, Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Clear cell	`X`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

■ A dot indicates a cell through which a line must run, but the exact course of the line has not yet been determined.

Solve puzzles:

Left-click: Empty cell→black cell→dot→empty cell.
Left-drag: The line follows the movement of the mouse pointer.
Rigt-click: Dropdown menu → Markers.
Rigt-drag: Deletes the cells under the mouse pointer.
Tap: Empty cell→black cell→dot→empty cell..
Drag: The line follows the movement of the finger.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow Keys: The line follows the movement of the selection frame.
Enter, Spacebar, Ins: Empty cell→black cell→dot→empty cell..
Del, Backspace: Empty the cell.

Change the cell directly with one of the following keys::

Value	Keys
Dot	`A`, `.`, `O`
Black cell	`S`, `,`, `X`
Empty cell	`D`,, `-` , `/`, `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

■ A dot indicates a cell through which a line must run, but the exact course of the line has not yet been determined.

Solve puzzles:

Left-click: Empty cell→dot→black cell→empty cell.
Left-drag: The line follows the movement of the mouse pointer.
Rigt-click: Dropdown menu → Markers.
Rigt-drag: Deletes the cells under the mouse pointer.
Tap: Empty cell→dot→black cell→empty cell.
Drag: The line follows the movement of the finger.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow Keys: The line follows the movement of the selection frame.
Enter, Spacebar, Ins: Empty cell→dot→black cell→empty cell.
Del, Backspace: Empty the cell.

Change the cell directly with one of the following keys::

Value	Keys
Dot	`A`, `.`, `O`
Black cell	`S`, `,`, `X`
Empty cell	`D`,, `-` , `/`, `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

■ A dot indicates a cell through which a line must run, but the exact course of the line has not yet been determined
× A cross indicates a cell through which no line is certain to run.

Solve puzzles:

Left-click: Empty cell→dot→cross→empty cell.
Left-drag: The line follows the movement of the mouse pointer.
Rigt-click: Dropdown menu → Markers.
Rigt-drag: Deletes the cells under the mouse pointer.
Tap: Empty cell→dot→cross→empty cell.
Drag: The line follows the movement of the finger.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow Keys: The line follows the movement of the selection frame.
Enter, Spacebar, Ins: Empty cell→dot→cross→empty cell.
Del, Backspace: Empty the cell.

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-drag: The line follows the movement of the mouse pointer.
Right-drag: Deletes the cells under the mouse pointer.
Left-click: Deletes the cell.
Right-click: Displays the dropdown menu→ Markers.
Drag: The line follows the movement of the finger.
Deletes the cell.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow Keys: The line follows the movement of the selection frame.
Del, Backspace: Empty the cell.

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

■ A dot indicates a cell through which a line must run, but the exact course of the line has not yet been determined.
× A cross indicates a cell through which no line is certain to run.

Solve puzzles:

Left-click: Empty cell→dot→cross→empty cell.
Left-drag: The line follows the movement of the mouse pointer.
Rigt-click: Dropdown menu → Markers.
Rigt-drag: Deletes the cells under the mouse pointer.
Tap: Empty cell→dot→cross→empty cell.
Drag: The line follows the movement of the finger.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Shift+Arrow Keys: The line follows the movement of the selection frame.
Enter, Spacebar, Ins: Empty cell→dot→cross→empty cell.
Del, Backspace: Empty the cell.

Change the cell directly with one of the following keys::

Value	Keys
Dot	`S`, `.`, `O`
Cross	`A`, `,`, `X`
Empty cell	`D`,, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers/letters (which cannot be changed) are shown in in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).

Solve puzzles:

Left-click: Dropdown menu → Numbers/letters.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Numbers/letters.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter the required number using the number keys (1, 2, 3, …).
Enter the required letter using the letter keys (a, b, c, …)
0, X, - , Del, Backspace .

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Candidate list:

or F7 key turn the candidate mode on and off again. In candidate mode, the list of values that a cell can take on is edited.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default letters (which cannot be changed) are shown in colours other than black; the letters you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).
"×" means "certainly not a letter".
"?" means "certainly a letter, but this is not yet known".

Solve puzzles:

Left-click: Dropdown menu → Values.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Values.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Letters→Cross→Question mark→Empty.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Letter	Letter keys
Cross	`X`, `,`
Question mark	`?`, `.`
Clear cell	`-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Candidate list:

or F7 key turn the candidate mode on and off again. In candidate mode, the list of values that a cell can take on is edited.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with a circle.
Cell with a given circle.
Cell that cannot contain a circle.
Cell that certainly does not contain a circle. Marking cells without a circle with a cross is optional.

Solve puzzles:

Left-click: Changes the value of the cell: circle, cross, empty cell.
Left-drag: Copies the value of the cell: circle, cross, empty cell.
Rigt-click: Dropdown menu → Markers.
Tap: Changes the value of the cell: circle, cross, empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the value of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the value of the cell: circle, cross, empty cell.
Shift+Arrow Keys: Copies the value of the cell: circle, cross, empty cell.

Select a colour directly with one of the following keys:

Value	Keys
Circle	`A`, `.`, `O`
Cross	`S`, `,`, `X`
Empty Cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with a mine
Cell with a buoy (neighbouring four mines)
Cell on which there is certainly no mine. Marking cells without a mine with a cross is optional.

Solve puzzles:

Left-click: Changes the cell content: mine, cross, empty cell.
Left-drag: Copies the cell content: mine, cross, empty cell.
Rigt-click: Dropdown menu → Markers.
Tap: Changes the cell content: mine, cross, empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: mine, cross, empty cell.
Shift+Arrow Keys: Copies the cell content: mine, cross, empty cell.

Select a value directly with one of the following keys:

Value	Keys
Mine	`A`, `.`, `O`
Cross	`S`, `,`, `X`
Emty cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with a tree.
Cell with a tent.
Cell that is known not to contain a tent. Marking cells without a tree with a cross is optional.

Solve puzzles:

Left-click: Changes the cell content: tent, cross, or empty cell.
Left-drag: Copies the cell content: tent, cross, or empty cell.
Rigt-click: Dropdown menu → Markers.
Tap: Changes the cell content: tent, cross, or empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: tent, cross, or empty cell.
Shift+Arrow Keys: Copies the cell content: tent, cross, or empty cell.

Select a colour directly with one of the following keys:

Colour	Keys
Tent	`T`, `A`, `Z`, `O`, `,`
Cross	`S`, `.`, `X`
Empty cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell content: white circle, black circle, cross, empty cell.
Left-drag: Copies the cell content: white circle, black circle, cross, empty cell.
Right-click: Dropdown menu → Markers.
Tap: Changes the cell content: white circle, black circle, cross, empty cell.
Drag: Copies the cell content.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: white circle, black circle, cross, empty cell.
Shift+Arrow Keys: Copies the cell content: white circle, black circle, cross, empty cell.

Select a symbol directly with one of the following keys:

Symbol	Keys
Black circle	`B`,`S`, `.`
White circle	`W`, `O`
Cross	`X`, `,`
Empty cell	`/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white or black circles form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: black, white, neutral.
Left-drag: Copies the colour of the cell: black, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: black, white, neutral.
Drag: Copies the colour of the cell.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral.
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Black	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Cell with lamp post (with two neighbouring lamps).
Cell with a lamp
A cell on which there is certainly no lamp. Marking cells without a lamp with a cross is optional.
Illuminated cells are shown in yellow; non-illuminated cells are shown in white.

Solve puzzles:

Left-click: Changes the value of the cell: lamp, cross, or empty cell.
Tap: Changes the value of the cell: lamp, cross, or empty cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral.

Select a value directly with one of the following keys:

Value	Keys
Lamp	`A`, `.`, `O`
Cross	`S`, `,`, `X`
Emty cell	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white cells form several disjoint areas, each area is displayed in a different colour.
Neighbouring black cells are marked with a red dot.
If the path between two circle cells does not turn orthogonally at least twice, the affected circles are circled in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell content: Tohu (T), Vohu (V), empty cell.
Left-drag: Copies the cell content: Tohu (T), Vohu (V), empty cell.
Rigt-click: Dropdown menu → Markers.
Tap: Changes the cell content: Tohu (T), Vohu (V), empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: Tohu (T), Vohu (V), empty cell.
Shift+Arrow Keys: Copies the cell content: Tohu (T), Vohu (V), empty cell.

Select a colour directly with one of the following keys:

Colour	Keys
Tohu	`T`, `.`
Vohu	`V`, `,`
Empty cell	`/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

The correct areas are coloured grey
If you work with colours, the correct areas are shaded with the selected colour.

Drawing methods:

There are two different methods, which you can also use together:
Lines: You can define areas by drawing borders between the areas.
Cells: You can define the areas by colouring all the cells belonging to an area with the same colour. Where two differently coloured areas meet, a borderline is automatically drawn. Two areas of the same colour must not be orthogonally adjacent.
Colour marking is suitable, for example, for marking two distant cells as belonging to the same area without knowing the exact boundary.
Both methods can be used in combination.

Solve puzzles:

Left-click (cell): Colour cell ().
Left-click (line): Border → Cross → Grid ().
Left-drag (cells): Copy colour.
Left-drag (lines): Copy line.
Right-click (cell): Dropdown menu → Colour selection → Symbol selection.
Tap (cell): Colour cell ().
Tap (line): Border → Cross → Grid ().
Drag (cells): Copy colour.
Drag (lines): Copy line.
Hold (cell): Dropdown menu → Colour selection → Symbol selection.
Arrow Keys: Move the selection frame.
Numeric keys: Select colour.
Delete or Backspace key: Delete colour.
Shift+Arrow Keys: Copy colour.

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.
The keyboard cannot change lines, so only the colour concept is available.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: black, white, neutral.
Left-drag: Copies the colour of the cell: black, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: black, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Black	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the black cells do not form a single orthogonally contiguous area, each sub-area is coloured differently.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: black, white, neutral.
Left-drag: Copies the colour of the cell: black, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: black, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Black	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
Numbers that do not "see" exactly one black cell are circled in red.
Disjoint areas of white cells are shown in different colours

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: black, white, neutral.
Left-drag: Copies the colour of the cell: black, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: black, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Black	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
Number cells that "see" not enough cells of the same colour are circled in red.
Empty (neutral) fields are marked with a red dot.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: black, white, neutral.
Left-drag: Copies the colour of the cell: black, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: black, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Black	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white cells do not form a single orthogonally contiguous area, each sub-area is coloured differently.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: dark, white, neutral.
Left-drag: Copies the colour of the cell: dark, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: dark, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: dark, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: dark, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Dark	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white cells do not form a single orthogonally contiguous area, each sub-area is coloured differently.
If an area does not contain the required number of black cells, the area number is circled in red.
If a strip of white cells extends over more than two areas, the cells are marked with a red dot.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: black, white, neutral.
Left-drag: Copies the colour of the cell: black, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: black, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: black, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: black, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Black	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white cells form several disjoint areas, each area is displayed in a different colour. Neighbouring black cells are marked with a red dot.
If the path between two circle cells does not turn orthogonally at least twice, the affected circles are circled in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the colour of the cell: dark, white, neutral.
Left-drag: Copies the colour of the cell: dark, white, neutral.
Right-click: Dropdown menu → Markers.
Tap: Changes the colour of the cell: dark, white, neutral.
Drag: Dropdown menu → Markers.
Hold: Copies the colour of the cell.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the colour of the cell: dark, white, neutral
Shift+Arrow Keys: Copies the colour of the cell: dark, white, neutral.

Select a colour directly with one of the following keys:

Colour	Keys
Dark	`A`, `.`
White	`S`, `,`
Neutral	`D`, `/`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Solve puzzles:

Left-click: Changes the cell content: black circle, white circle, empty cell.
Left-drag: Copies the cell content: black circle, white circle, empty cell.
Right-click: Dropdown menu → Markers.
Tap: Changes the cell content: black circle, white circle, empty cell.
Drag: Dropdown menu → Markers.
Hold: Copies the cell content.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Changes the cell content: black circle, white circle, empty cell.
Shift+Arrow Keys: Copies the cell content: black circle, white circle, empty cell.

Select a colour directly with one of the following keys:

Colour	Keys
Black circle	`A`, `.`
White circle	`S`, `,`
Empty cell	`Space` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.
If the white or black circles form several disjoint areas, each area is displayed in a different colour.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers (which cannot be changed) are shown in in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).
"x" means "certainly not a number".

Solve puzzles:

Left-click: Dropdown menu → Values.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Values.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Empty→Cross→Empty.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Cross	`X`, `,`
Clear cell	`-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers (which cannot be changed) are shown in in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).
"x" means "certainly not a number".
"O" means "certainly a number, but this is not yet known"

Solve puzzles:

Left-click: Dropdown menu → Values.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Values.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Empty→Circle→Cross→Empty.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Cross	`X`, `,`
Circle	`O`, `.`
Clear cell	`-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers (which cannot be changed) are shown in in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).
"×" means "certainly not a number".
"?" means "certainly a number, but this is not yet known".

Solve puzzles:

Left-click: Dropdown menu → Values.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Values.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Empty→Question mark→Cross→Empty.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Cross	`X`, `,`
Question mark	`O`, `.`
Clear cell	`-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Candidate list:

or F7 key turn the candidate mode on and off again. In candidate mode, the list of values that a cell can take on is edited.

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.

Correct solution:

If you have solved the puzzle correctly, a green frame is automatically displayed around the grid.

Appearance:

Default numbers (which cannot be changed) are shown in in colours other than black; the numbers you enter are shown in black colour.
The dropdown menu contains the symbol "🅇" (clear cell).

Solve puzzles:

Left-click: Dropdown menu → Values.
Right-click: Dropdown menu → Markers.
Tap: Dropdown menu → Values.
Hold: Dropdown menu → Markers.
Use the arrow keys to move the selection frame to a cell, then:
Enter, Spacebar, Ins: Value = Value+1.
Del, Backspace : Clear cell.

Change the value directly with one of the following keys:

Value	Keys
Number	Numeric keys
Clear cell	`0`, `X`, `-` , `Del`, `Backspace`

The selection frame is only displayed when you work with the keyboard, i.e., after pressing one of the arrow keys, and hides again when you work with the mouse.
Move the mouse pointer over a cell (do not click!) and choose the required value directly with the keyboard, as described above.

Candidate list:

or F7 key turn the candidate mode on and off again. In candidate mode, the list of values that a cell can take on is edited.
Right-click on or hold - сandidates are automatically generated (not in all puzzles).

Error marking:

or F6 key marks all errors, i.e., violations of the rules, in red.

Symbol marking:

Permanent:

turn on the marking mode and select the symbol (〇, ▢, •, ⛭, ✕, a, b, c, d) to be entered in the subsequently selected cells.

Single cell:

Select a cell with the arrow keys, then Ctrl+Q, W, E, R, X, A, B, C, D.
Right-click, then select symbol in the drop-down menu.
Hold the finger and select symbol in the drop-down menu.

Colour marking:

Permanent:

selects the colour with which subsequent moves are marked.
Combination of Alt+0 to Alt+9 select the colour with which subsequent moves are marked.

Single cell:

Select a cell with the arrow keys, then Ctrl+0 to Ctrl+9.
Right-click, then select colour in the drop-down menu.
Hold the finger and select colour in the drop-down menu.

Features:

or Home cancels all moves.
PgDn or Ctrl+Z cancels a move.
PgUp or Ctrl+Y restores a cancelled move.
or End restores all cancelled moves.
or Ctrl+S saves the current savegame.
or Ctrl+L loads a previously saved savegame.
or F3 switches the hint mode on and off again. In hint mode, the correct value is entered in the following selected cells.
or F4 enters the solution in the grid and, if available, the solution path in the move list.

Enlarge/reduce the puzzle:

The puzzle can be zoomed in/out within the window:
Left-click or tap: Select cell size.
Rght-click or hold: Fit the puzzle to the window size ("auto").
Drag with two fingers: the grid size follows the distance between the two fingers.
Ctrl+Arrow keys.

Moving the puzzle:

This is only possible if the puzzle is larger than the window or screen.
Use the scrollbars.
Drag with two fingers: the grid follows the finger movement.
Alt+Arrow keys.

Info:

or F1 shows information about the puzzle in a separate window. It contains, among other things, the current score and the sequence of moves that led to it.