To win a round of Minesweeper, you must click on the board every square that doesn't have a mine under it. Once you've done so, the game will be over. If you accidentally click a square that has a mine beneath it, the game will be over. You'll have the option of starting a new game or redoing the one you just played.

Whenever you see a 1 next to a 2 against a wall, you know that the space opposite the 2 is a mine. This is because there can only be one mine in the two spaces adjacent to the 1, which means the second mine must be adjacent to the 2 in the final space.