Minesweeper

Minesweeper is a logic puzzle. Locate the mines in a minefield. The mine detector shows the number of mines in the neighbourhood.

Rules: Mark mine in some of the cells of the grid. The number in a cell indicates how many of the eight neighbouring cells contain mine. A cell with a number in it does not contain a mine.
In some tasks, the number of mines to find is given; in other tasks, you have to find out the number of mines yourself.