Your objective
Reveal every cell that does not contain a mine. You win as soon as all safe cells are open, even if you have not flagged the mines. Revealing a mine ends the run.
What the numbers mean
A revealed number counts mines touching that cell: above, below, beside it and diagonally. A 1 has exactly one neighboring mine; a 3 has three. An empty revealed cell has zero neighboring mines and automatically opens nearby safe cells. Numbers describe only their immediate neighbors.
Reveal and flag
Choose Reveal mode and tap a covered cell. Your first reveal cannot be a mine. On standard boards, its neighboring cells are also safe, so the opening gives you space to reason. Flags placed before that first reveal do not start the clock.
Switch to Flag mode to mark a suspected mine, or right-click on desktop. Tap or right-click a flagged cell again to remove its flag. Revealed cells cannot be flagged, and a flagged cell must be unflagged before you can reveal it. You can place at most the configured mine count in current flags. The remaining-mines estimate subtracts current flags; it does not prove those flags are correct.
How Chord works
When a revealed number has exactly that many flagged neighbors, Chord reveals the other neighboring cells together. Select Chord mode and tap the number, press C while it is selected, or use Chord selected cell. A matching flag count is only permission to chord: if the flags are wrong and an unflagged neighbor is a mine, the chord loses the game.
A beginner’s approach
Look for a revealed 1 touching only one covered cell: that covered cell must be a mine. Once you flag it, other cells around the 1 are safe. Next, compare two nearby numbers that share covered cells. A clue already satisfied by confirmed flags lets you clear its other neighbors; a clue with exactly as many covered neighbors as missing mines tells you to flag all of them.
Avoid common mistakes
Remember diagonal neighbors. Count only adjacent flags, and avoid treating a tentative flag as a proven deduction. Do not chord just because a number matches your flags; first check why each flag belongs there. If your reasoning reaches a position with no forced move, a guess may be necessary. Puzzuno’s fields, including Daily Challenges, are not verified as no-guess.
Difficulty and board size
| Difficulty | Columns × rows | Mines |
|---|---|---|
| Beginner | 9 × 9 | 10 |
| Intermediate | 16 × 16 | 40 |
| Expert | 30 × 16 | 99 |
| Custom | 5–30 × 5–24 | 1 to cells−1 |
More cells and higher mine density create longer chains of deductions. Custom boards count toward general play statistics but do not set standard difficulty time records or qualify for No Flag Win. Extremely dense custom boards may protect only the first clicked cell, because there is not enough room to protect all its neighbors.
Keyboard and mobile
Arrow keys move selection; Enter or Space reveals, F toggles a flag and C chords an eligible number. Mobile Reveal, Flag and Chord buttons provide all core actions without long presses. Wide fields scroll inside their own frame: swipe sideways to explore Expert, while the status and tap modes stay available as you move down the page.
Frequently asked questions
Does the first click change the field?
Yes. Mines are placed when you first reveal a cell, keeping the opening safe. In a Daily Challenge, the same date and first click produce the same field. A different first click can produce a different opening.
Is Daily always solvable without guessing?
No. Daily Challenges have a safe first reveal, just like practice. It may require guesses. We do not promise mathematical no-guess generation.
What does Restart do?
Restart clears your moves. Choose the same first reveal cell to play the same field again. Play Again does the same after a win or loss; New Game gives you a fresh practice field. Daily Challenges keep the same starting conditions. Repeated completions do not earn the same Daily rewards or qualify your streak again.
Can I pause and come back?
Pause conceals the board and stops active timing. Moves save immediately and time saves regularly. Leaving the page pauses play; reopening a saved game excludes time away and requires resume. If browser storage is unavailable, play works temporarily for this visit. There is no cloud backup.
What counts as a no-flag win?
Complete a standard field without ever placing a flag. Placing one and later removing it still counts as flag use. The result reports cumulative flags placed, while the remaining-mines estimate uses flags currently on the board.
What happens after a loss?
The exploded mine is shown as ✹, other mines as ● or correctly placed flags, and incorrect flags as ⚑×. The attempt counts as played and contributes active time and loss statistics, but it does not earn a completion reward or extend your daily streak.
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