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Exposing a zero means that there are no adjacent mines, so exposing all adjacent squares is guaranteed safe. As a convenience to the player, the game continues to expose adjacent squares until a non-zero square is reached.

The numbers on the board represent how many bombs are adjacent to a square. For example, if a square has a "3" on it, then there are 3 bombs next to that square. The bombs could be above, below, right left, or diagonal to the square.

A simple trick is to press both buttons ("chord") on a number to depress (but not open) the squares it touches. This shows you how many squares are touching the number. The pink 2 touches three squares and cannot be solved.

Avoid unecessary guesses. Instead of opening three squares in a row open the yellow squares first so you have time to react if the middle square is a mine. If you open the middle square you need to make another guess. The fourth strategy opens the blue square to eliminate the guess.