Rules & objective
Reveal every safe square without hitting a mine.
- Your first reveal and its neighboring squares are safe. The remaining board still needs careful deduction and may present uncertain choices.
- A number is the total count of adjacent mines, not the number of mines still unflagged.
- Flags mark suspected mines but do not prove a square is dangerous. Winning requires revealing all safe squares; hitting a mine ends the round.
Key terms
- Neighbor
- Any square touching a clue along an edge or corner.
- Flag
- Your marker for a suspected mine.
- Frontier
- The boundary between revealed clues and hidden squares.
Difficulty levels
| Level | What changes |
|---|---|
| Easy | 8 × 8 board with 8 mines. Your first reveal is safe. |
| Medium | 9 × 9 board with 14 mines. More clues to connect. |
| Hard | 10 × 10 board with 22 mines. Denser deductions. |
Changing difficulty starts a fresh round. Personal bests are tracked separately.
This version on puzzle free online
Right-click to toggle a flag on desktop, or switch the on-screen Flag mode on a phone. The tiers increase both board size and mine count, from 8 mines on Easy to 22 on Hard.
Common questions
Does a flag reveal whether I was right?
No. A flag is a player annotation. An incorrect flag can make later deductions look convincing but wrong.
Are diagonal mines counted?
Yes. A numbered square counts all eight surrounding positions that lie inside the board.