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.