New Sudoku variant – Rossini Sudoku.
We have also added 150 other new puzzles since the previous update: Jigsaw Sudoku (201-220), Anti-Knight Sudoku (101-120), Argyle Sudoku (101-120), Asterisk Sudoku (101-120), Kropki Sudoku (91-100), Greater-Than Sudoku (91-100), Frame Sudoku (91-100), Sukaku (101-120), Girandola Sudoku (81-100).

New puzzle type – Trilogy.
We have also added 180 other new puzzles since the previous update: Sudoku (501-520), Anti-King Sudoku (101-120), Low-High Sudoku (101-120), Center Dot Sudoku (101-120), Snowflake Sudoku (101-120), Nonconsecutive Sudoku (101-120), Disjoint Groups Sudoku (101-120), Skyscrapers Sudoku (101-120), Odd-Even Sudoku (101-120).

New puzzle type – Shirokuro.
We have also added 90 other new puzzles since the previous update: Tohu-Wa-Vohu (76-90), Lighthouses (76-90), Hidoku (121-135), Kapetto (76-90), Sukoro (76-90), Norinori (76-90), Araf (76-90).

Fixed broken calculator for Killer Sudoku, etc. – moved it to the accordion under the puzzle.

New puzzle type – Yakazu.
We have also added 135 other new puzzles since the previous update: Arukone (75-90), Mochikoro (76-90). Walls (76-85), Tents and Trees (81-90), Akari (76-90), Kuromasu (76-90), Knossos (76-90), Creek (76-90), Heyawake (76-90).

New puzzle type – Curving Road.
We have also added 105 other new puzzles since the previous update: Fobidoshi (76-90). Patchwork (76-90), Suguru (106-120), Bridges (76-90), Shikaku (76-90), Yin Yang (76-90), Linesweeper (76-90).

New puzzle type – Neighbours.
We have also added 170 other new puzzles since the previous update: Sudoku (481-500), Corral (75-90), Kropki Sudoku (81-90), Frame Sudoku (81-90), Greater-Than Sudoku (81-90), Doors (76-90), Killer Sudoku (141-160), Nurikabe (76-90), Jigsaw Sudoku (81-200), Masyu (76-90), Girandola Sudoku (61-80).

Error checking has been added to the additional rules for Low-High Sudoku, Argyle Sudoku, Bold X Sudoku and SnowFlake Sudoku.
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Right-click on or hold – Now, candidates are generated correctly in multi-sudoku. Option description added to short manuals.

New Sudoku variant – Girandola Sudoku.
We have also added 180 other new puzzles since the previous update: Irasuto (76-90), Doubledoku (81-100), Slalom (76-90), Twodoku (81-100), Koburin (76-90), Sensei Sudoku (81-100), Minesweeper (76-90).

Error checking has been added to the additional rules for Anti-King Sudoku, Anti-Knight Sudoku, Nonconsecutive Sudoku, Disjoint Groups Sudoku, Asterisk Sudoku, Center Dot Sudoku, Windoku and, of course, Girandola Sudoku.
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New puzzle type – Arrow Web.
We have also added 140 other new puzzles since the previous update: Samurai Sudoku (101-120), ABC End View (76-90), Bricks (76-90), Mathrax (76-90), Straights (76-90), Eulero (76-90), Double Block (76-90), Tenner Grid (76-90), Hakyuu (76-90).

Fixed all known issues. The website design has been updated with a few minor tweaks.