The object of Minesweeper is to locate all the mines as quickly as possible without uncovering any of them.
The number in the upper-left of the game board indicates the number of flags left to place. The number on the upper-left of the game board indicates how many seconds have elapsed since the game started. The button between these counters starts a new game.
Click a tile on the minefield to uncover it. A number tile ( - ) indicates how many mines are in the tiles surrounding it.
You can right-click a tile to flag it as a mine ( ) to help you keep track. Flagging a tile decreases the mine counter in the upper left of the window. If the marking feature is enabled (Game > Marks), right-clicking a tile twice will mark the tile ( ) if you're unsure about it. Right-clicking the tile once more will clear it.
Uncovering a mine tile ( ) will cause you to lose the game. Correctly flagged tiles will remain as flags, while incorrectly flagged tiles will show a crossed-out mine ( ).
The game ends when a mine is uncovered, or the last safe tile is uncovered.