Flag a Mine
7×7 · 10 mines · classic pace
Reveal every safe cell without hitting a mine.
About PlayMemorize Flag a Mine
PlayMemorize Flag a Mine is a Minesweeper deduction trainer. Every round shows a partially-revealed board · the standard Minesweeper grid with numbers visible and some cells still face-down. Exactly one of the unrevealed cells is guaranteed to be a mine by the numbered hints around it · find it and flag it. One wrong flag ends the run.
Why a Minesweeper trainer at all. Classical Minesweeper combines two skills: deduction (when the numbers force a conclusion) and guessing (when they don't). The guessing half is unavoidable in the standard game · sometimes you're left with a 50/50 and just have to pick. Flag a Mine isolates the deduction half so you train only the part of Minesweeper that's actually a thinking skill, not the luck part. Every round is a pure reasoning win when you solve it.
Cheat-proof validation. A pure verifyGuaranteedMine function enumerates every possible mine placement consistent with the revealed numbers · the full constraint-satisfaction space. If the target cell contains a mine in every valid placement, the flag is correct. If even one placement leaves the cell empty, the answer is wrong. The validator is the sole oracle · pure constraint satisfaction, no preset flag.
Pure deduction, no luck. The puzzle generator only ships boards where at least one unrevealed cell is a provable mine. Unlike classical Minesweeper, there are no 50/50 guesses · if you can't find the answer, the answer is still there waiting to be deduced. That makes a streak in Flag a Mine a real measure of your Minesweeper reasoning, not your luck.
Part of the PlayMemorize family of brain-training games. Runs entirely in your browser, works offline as a Progressive Web App.
FAQ
Q: What is Flag a Mine?
A free Minesweeper deduction trainer. Each round shows a partially-revealed board. Exactly one unrevealed cell is guaranteed to be a mine by the surrounding numbered hints. Flag it to grow your streak; miss once and the run ends.
Q: How is the answer validated?
A pure function called verifyGuaranteedMine enumerates every possible mine placement consistent with the revealed numbers. If the target cell contains a mine in every one of those placements, the answer is correct. The function is the sole oracle · no preset flag to cheat against.
Q: Is there always a provable answer?
Yes · every round is generated so at least one unrevealed cell is a guaranteed mine. Unlike classical Minesweeper, there are no 50/50 guesses. Every round is a pure reasoning win when you solve it · if you can't find the answer, the answer is still there waiting to be deduced.
Q: Will this make me better at full Minesweeper?
Yes · the deduction half is what actually translates between the two games. Once you can scan a partially-revealed board and immediately spot a forced mine, the same skill makes you faster and more accurate in full Minesweeper rounds. The remaining 50/50 guesses in full Minesweeper are luck either way, but the deduction skill is trainable.
Q: How does my progress save?
Your high streak is stored locally in your browser.
