Open every square that does not contain a mine. A number tells you how many mines touch that square, including diagonally. Start with the board above, then use the examples below to check your next decision.
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Reveal every safe cell. Each number counts mines in its eight neighboring cells, including diagonals. Classic has a 9 × 9 board and ten mines; Practice has a 6 × 6 board and five mines. Your first cell and its neighbors are safe. On a phone, select Flag before marking a suspected mine; on a computer, right-click. A flag is an assumption until the clues prove it. Some boards can require guessing.
Classic uses a nine-by-nine board with ten mines. Practice uses six rows and six columns with five mines. The smaller board changes the amount of space you need to inspect, not the meaning of the clues. Both modes end when every safe square has been opened.
Flags are reminders and protection against accidental clicks. They are not the win condition. A board can show no mines left to flag while several safe squares remain covered. You can also place a flag incorrectly; the game does not turn a guess into a proven mine just because you marked it.
Mine placement happens after the first reveal. The chosen square and its neighbors are excluded from mine placement. When a zero is opened, connected safe space expands and the numbered boundary becomes visible. That is why a single first click can uncover a large area.
A safe opening is not a promise that every later move can be deduced. Some visible positions still allow several different mine arrangements. In those positions, a safe-looking click and a logically forced click are different claims. Keep that distinction when reading tips or copying a pattern.
Every clue looks at the surrounding horizontal, vertical, and diagonal squares. A corner has fewer neighbors than a middle square, but a one still means exactly one adjacent mine. Do not treat the digit as an arrow pointing toward the nearest covered tile.
Suppose a revealed one has only one covered neighbor and all its other neighbors are open. That covered square must be the mine. If it has two possible covered neighbors, the clue alone cannot tell you which one is dangerous. Another nearby clue may narrow the choice.
Start by comparing overlapping groups of covered neighbors. Two clues may share most of their possible mine positions. The difference between their remaining groups can prove something that neither clue establishes alone. Check every diagonal before using that deduction.
Keep assumptions separate from proof. If a flag was placed only because a square looked suspicious, do not subtract it from another clue as if its location were certain. Revisit the reason for a flag when a later clue seems inconsistent.
Finally, scan the edge of the revealed area instead of clicking randomly across the board. Look for a clue whose mines are already identified or whose number equals its remaining covered neighbors. If several arrangements still fit, say that the position is uncertain rather than treating a familiar shape as magic.
On a phone, switch to Mark flag before tapping a covered square you want to mark. Switch back to Reveal when you are ready to open squares. The selected mode determines what a tap does, so check that control if a square is being flagged instead of revealed.
On a computer, right-click a covered square to toggle its flag. Remove a flag before trying to reveal that square. You can correct a mistaken mark without abandoning the board or clearing every other flag.
The game saves progress in this browser. Classic and Practice keep separate boards. A different browser or device has separate data, and clearing site storage can remove the saved position. The timer pauses when you leave the tab or open a dialog, so a break does not have to become an uninterrupted session.
Opening a mine ends the board. Revealing every safe square records a local win and its time. Those records are not a global leaderboard or evidence that another player is online. For a worked opening, follow the first-click guide; for deeper deductions, use the strategy guide alongside a visible board.
Yes. Every adjacent square counts, including the four diagonal positions when they exist.
Yes. The clicked square and its surrounding neighbors are excluded from mine placement.
No. First-click protection and a solver-verified no-guess generator are different features.
No. You win by revealing every non-mine square.
Yes. It is saved in the same browser, subject to that browser retaining site data.