Find all the mines on the board as quickly as possible without uncovering any of them.
Uncover a square by left clicking it.
If you uncover a mine, you lose the game.
If a number occurs, it indicates the number of mines in the 8 squares around this square.
Mark a square (where you suspect a mine) by right clicking it (or shift + left click).
In professional mode you can't place any marks, so you have to remember the locations of the mines.
If all mines around a numbered square are marked, you can quickly uncover the remaining squares by left clicking the numbered square.
Left click the smiley to start a new game.
Trouble shooting: If the game is not starting please make sure you have at least a Java plugin of version 1.4 or higher installed and check the Java console.