Minesweeper

The goal. Reveal every cell that doesn't hide a mine. The numbers tell you how many mines sit in the eight cells around them; use the numbers to deduce where the mines are without revealing one.

Reveal. Left-click an unrevealed cell to reveal it. If the cell hides a 0 (no neighboring mines), every neighboring cell reveals too — an open area cascades automatically. If the cell hides a number, just that cell reveals. If the cell hides a mine, you lose.

Flag. Right-click an unrevealed cell to place a flag (or remove one). Flagged cells can't be left-clicked, so you don't trip your own flags.

Chord. If you've correctly flagged every mine around a revealed number, middle-click the number (or hold left and right at the same time) to reveal every other neighbor of that number in one step. This is the power-user reveal — ignore it if you don't need the speed.

Touch. Long-press a cell to flag it. Or, tap the Flag mode toggle and your taps place flags until you toggle it back; this is the cleaner option if you're playing on a phone.

Hint. Press the Hint button (or H) for a one-line explanation of the next deducible cell. The page never reveals the cell for you — you take the deduction.

No-guess generator. Every board on this page is generated so that pure logical deduction can solve it from your first click. You'll never have to flip a coin between two equally-likely cells. If you get stuck, the deduction is in there — press Hint.

First-click safety. The first cell you reveal is never a mine, and neither are any of its eight neighbors — the first click always opens up a small clear area. The board is generated after your first click, so the safety is mathematical, not luck.

Sizes. Beginner is 9×9 with 10 mines. Intermediate is 16×16 with 40. Expert is 30×16 with 99. Personal-best time is tracked per size in your browser.

No undo. A wrong reveal ends the game. That's the format.