Home › Evil Sudoku
Evil Sudoku
The cruellest boards we deal — minimal clues, maximal chains. "Evil" (sometimes called very hard or diabolical) demands the advanced techniques most solvers never learn.
Play Evil Sudoku free →What "evil" really means
Evil Sudoku is our Expert tier under a name you'll recognise from other sites. With as few as 22–24 clues, singles and pairs run out quickly. To break through you'll lean on X-Wings, Swordfish and XY-Wings — coordinated eliminations across multiple rows and columns at once.
- Fewest clues, longest deduction chains — expect 20+ minutes.
- Still 100% logic: no guessing, exactly one solution, always.
- Learn the techniques that crack them in our X-Wing and XY-Wing guides.
Is evil Sudoku the same as expert?
Yes — different sites use different names for the top tier. On Playoku, Expert and Evil are the same difficulty (level 3). Whichever you search for, you'll get the hardest logic-solvable boards we generate.
Stuck on an evil board?
When a board defeats you, paste it into the step-by-step solver. It names each technique as it applies it — so an evil puzzle becomes a lesson, not a wall.