An example of Minesweeper.

Minesweeper is a type of computer-based video game in which players clear an imaginary field of mines by discovering which areas are and are not safe. By clicking on a square with the mouse, a player can determine if an area is clear or not. If the area is clear, it will either have no numbers in it, meaning no mines are adjacent to the square, or it will have a number in it, which informs you of how many mines are adjacent to that square. Clicking on a mine is a loss. The game is won when the player has uncovered every non-mine square.