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Left click to check for mines.
Right click to place a flag.
There are safe tiles, and tiles where mines are hidden. Safe squares will contain a number telling you how many mines are in surrounding tiles. Use these numbers, and what you know already know about nearby tiles to deduce which tiles contain the mines.
Clicking on a tile with a bomb will lose the game, however you can safely mark tiles with bombs by placing a flag (right click).
When you have identified all safe tiles, you win.
Note that the first click is always safe.