About this game
Play Minesweeper online with a safe first move, flags and four board sizes. Read the numbers and uncover every safe square in your browser.
How to play
Open a square to reveal a number: it counts mines in the eight surrounding squares. Flag squares you believe contain mines and reveal the safe ones. Choose 8×8 with 10 mines, 12×12 with 24, 16×16 with 40 or 20×20 with 80. Your first reveal is safe. Use a right-click or a long press to toggle a flag.
A useful starting tip
If a number already has that many confirmed mines around it, its other neighbours are safe. A flag records your deduction; it does not prove it.
Reveal the mine map gradually
Minesweeper lets you read the board through numbers. Each revealed clue constrains neighbouring cells, and nearby clues can refine the same unknown area. A useful move follows when you can explain why a cell is safe, rather than choosing a spot that merely looks promising. The information around an opening matters more than its visual distance from other mines.
Four board sizes offer different amounts to monitor, from compact 8×8 to 20×20. A small board is useful while learning to compare exposed boundaries. The first opening is protected, but later decisions depend on the information you uncover.
Turn a number into a decision
Count all neighbours, including diagonals, and separately account for mines already proved. When the required mines are established, the other adjacent cells are safe. If no conclusion follows, compare the clue with a neighbouring number or inspect another boundary. Do not turn a speculative flag into the foundation of a chain of later openings.
A flag is a conclusion
Put down a flag only after the neighbouring numbers force it. Then use that fact to simplify the next count. If a move depends on a guess, say so to yourself and search another edge of the board first; many positions reveal a certain move somewhere else.
Visual patterns before the next move
When two clues touch some of the same covered squares, compare their candidate sets instead of guessing. The visual Minesweeper guide walks through exact counts, satisfied clues, overlapping 1-and-2 clues, safe openings and corner deductions with original diagrams.
Questions and answers
Do numbers include diagonal mines?
Yes. Each number counts all eight neighbouring cells, including diagonals. Edge cells have fewer neighbours but use the same counting rule.
Does a flag prove a mine is there?
No, it records your conclusion. Opening other neighbours is justified only when the marked mines are logically established rather than guessed.
How do I flag a cell on a phone?
Press and hold a covered cell. On a computer, use the right mouse button. Opening a cell and marking a flag are separate actions.
Does a safe first move make the whole game safe?
No. Only the first opening is protected from a mine. Compare the numbers afterwards; insufficient evidence does not prove a cell safe.
How can two individually inconclusive clues give an answer?
Compare their complete unknown-neighbour sets. If the first has only A and B with one remaining mine, and the second A, B and C with one, C is safe: the required mine already lies in A or B. An additional unknown neighbour D for the second removes that conclusion. Subtract already proved mines from both clues before comparing the remaining conditions.
Which board is useful for learning to count?
Start with 8×8 and ten mines, where several boundaries and older flags remain easy to inspect together. Justify at least one opening aloud or mentally, then check all its neighbours, including diagonals. Progress to 12×12, 16×16 or 20×20 when you consistently connect several constraints. A larger board increases the amount to monitor; it does not replace careful counting with a different rule.
What should I do when flags lead to a contradiction?
Return to the reason for each mark. One may have started as a guess and later been used as an established fact. Recount neighbours around the disputed numbers and separate proved mines from hypotheses. Do not open a cell merely because it fits a mistaken arrangement. If the proof is incomplete, look for another condition along a different exposed boundary.
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