Classic logic game — flag mines, clear the board without exploding
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The most intellectually rigorous of the classic browser puzzle formats — on Beginner it is approachable in minutes, but Expert (30x16, 99 mines) tests spatial deduction at a level few casual puzzles match. Worth playing if you have only ever clicked randomly; the logic system rewards study.
Primarily skill. Most board positions can be fully solved by pure deduction. However, some configurations — particularly late in a game — produce genuine 50/50 guesses where no logical information distinguishes two cells. Expert players minimize guessing by working efficiently through the deducible sections first.
Chord-clicking is clicking on a numbered cell that already has exactly that number of adjacent flags placed. It instantly reveals all remaining adjacent unrevealed non-flagged cells. It is the key technique for playing at speed — experts use it constantly rather than clicking cells one at a time.
Beginner players typically take several minutes. Intermediate players complete Expert in 2-5 minutes. Top competitive players hold world records below 40 seconds on the 30x16 Expert board. Sub-90 seconds is considered a solid achievement for dedicated casual players.