How to Play Minesweeper
There are mines hidden in the grid. If you click on a mine, you lose. Clicking on a square reveals either a number, an empty space, or a mine. When you reveal all of the squares that don't have a mine, you win.
A number in a square tells you how many mines are hidden in the eight squares that surround it. A 1 means that one of the eight surrounding squares hides a mine. A 2 means that there are two mines hidden in the surrounding squares. And so on.
If you think that you have figured out where a mine is hidden, you can right-click on that square to put a flag there.