Mine Sweeper

Minesweeper is a single-player video game. The objective of the game is to clear an abstract minefield without detonating a mine. The player is initially presented with a grid of undifferentiated squares. Some randomly selected squares, unknown to the player, are designated to contain mines. Typically, the size of the grid and the number of mines are set in advance by the user, either by selecting the numbers or selecting from defined skill levels.
The game is played by revealing squares of the grid. If a square containing a mine is revealed, the player loses the game. Otherwise, a digit is revealed in the square, indicating the number of adjacent squares (typically, out of the possible eight) that contain mines. If this number is zero then the square appears blank, and the surrounding squares are automatically also revealed. By using logic, the player can in many instances use this information to deduce that certain other squares are mine-free, in which case they may be safely revealed, or mine-filled, in which they can be marked as such.
Mine Sweeper is a very interesting and time killing or passing game.