# How do I mark a bomb?

You should mark the bombs in order to win the game. You don't have to, however: the objective is to reveal all the spaces on the grid. If you reveal all non-bomb spaces, BombSquad will mark the remaining bombs for you.

To mark a bomb, hold down the shift or ctrl key while clicking on the square you want to mark. If you have a two-button mouse, you may alternately right-click on a square to mark it.

You might mark squares, and then later realize that the marking was in error.

To unmark an existing mark, simply shift-, ctrl-, or right-click on the desired square. This will restore the square to its unrevealed state. You can also click (with no special keys) to simply reveal a square that you have already marked.