Opening safe cells

Level: Basic

If the adjacent flag count equals the number, the rest are safe.

If the number of flags (confirmed mines) already placed around an open number cell equals that number, then the remaining closed neighbors hold no mines. You can open them all with confidence.

For example, if a cell showing 2 already has two flags around it, every other closed cell next to it is safe.

Alternating between 'confirming mines' and 'opening safe cells' is the basic rhythm of Minesweeper. With the chord feature, you can open all these safe cells at once.

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