Field Interaction (continued)

Squares containing a red flag may contain a bomb and therefore cannot be entered.

When a square without a flag is entered its colour changes and its secret is revealed.

If an entered square contains a bomb, it explodes and is displayed on a red background: the game is lost.

If an entered square is empty, its icon changes to a number indicating the number of surrounding bombs (the square's Danger level).

If an entered square has a Danger level of zero, the contents of neighbouring squares are also revealed - propagated effect.