QED Logic quod erat demonstrandum

Logic Ascent

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Logic Ascent

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Sharpen your thinking, one forced move at a time.

Fill the board: exactly 1 🐱 per row, column, and colored region — none touching, not even diagonally.
Click a cell to rule it out, click again to place one.

Solved. .

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Click the board to start.

Rating 1200 Novice

Solved by QED's own solver. Every step is forced by logic alone: nothing guessed, nothing written by hand. See how each technique works → · Questions or bugs? [email protected]