Play Evil Sudoku Online
Also known as diabolical, extreme, or expert Sudoku — this is the hardest tier, starting with only 22 clues. Nothing here yields to simple scanning; expect chains of hidden pairs, pointing groups, X-Wings, and Swordfish. Only for seasoned solvers.
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Scan with your iPhone cameraFrequently Asked Questions
What is evil Sudoku?+
Evil Sudoku (also called diabolical, extreme, or expert) is the hardest common difficulty tier. Our evil puzzles start with just 22 of 81 cells filled, so solving requires long chains of advanced techniques rather than any simple scanning.
What is the difference between hard and evil Sudoku?+
Hard puzzles can usually be cracked with hidden pairs and pointing groups. Evil puzzles remove more clues and require stacking advanced techniques together — X-Wings, Swordfish, and long elimination chains — often across the whole board.
Is evil Sudoku solvable without guessing?+
Yes. Like every well-formed Sudoku, an evil puzzle has a single solution reachable by pure logic. It simply demands more advanced techniques and patience — guessing is never required, only harder to resist.