Minesweeper

How to play

1. Choose Reveal and tap a hidden square. A number counts mines in all neighboring squares, including diagonals; an empty area opens automatically. If the board is unopened, the first reveal opens a safe area.
2. Choose Flag and tap a hidden square to mark a suspected mine; tap again in Flag mode to remove it. Right-click, hold a square on touch, or press F on a selected square to toggle a flag. The counter shows flags left, not verified mines.
3. Click a revealed number to open its unflagged neighbors when the neighboring flag count matches. This is chording: wrong flags can still expose a mine. Arrow keys move the selection; R reveals a hidden square.
4. Remove a flag before revealing that square. Flags are optional notes, not confirmed mines, and placing all flags does not complete the board.
5. Opening a mine ends the attempt. Reveal all safe squares to complete it.

Daily challenge

Everyone gets the same daily challenge for the UTC date. Your saved attempt resumes when you return; the next challenge arrives at midnight UTC. Daily results do not change Elo.