Evil Sudoku
The hardest tier we offer — also called extreme, very hard or diabolical. Experts only.
★ Solved
Brilliant!
Evil Sudoku is the toughest level on Sudoku.tips. You will also see this difficulty called extreme, very hard or diabolical elsewhere — they all describe the same thing: minimal clues and the deepest logic.
What an evil puzzle demands
Everything from the expert tier and then some. Each evil grid needs at least one short-chain technique — simple coloring, the W-Wing or the XYZ-Wing — and our solver confirms it can be finished with logic alone. Expect to spend serious time and to keep impeccable pencil marks.
Who evil Sudoku is for
Veteran solvers who have mastered the X-Wing and XY-Wing and want more. Every grid still has exactly one solution reachable by logic alone.
Frequently asked questions
Is evil the same as extreme or very hard Sudoku?
Yes. Evil, extreme, very hard and diabolical are different names for the hardest tier — minimal clues, advanced techniques required.
Do evil Sudoku puzzles require guessing?
No. They are still uniquely solvable by logic, but they need chain-based techniques such as coloring, the W-Wing or the XYZ-Wing rather than simple deductions.