Minesweeper

Preparing the board…

Rules and controls

Reveal opens a square. Press and hold a covered square to flag it without changing modes; right-click or the F key also works. Flag mode remains available for marking several squares. Click a revealed number to chord when its flags match. The first opening and its neighbors are safe; later guesses may still be necessary.

Refresh resumes saved progress. Restart covers every square, removes flags and resets the timer using the same seed; choose the same first square to replay the same layout. New game uses a new seed. There is no Undo or Hint during an attempt.