Printable Evil 9×9 Sudoku
Print free evil 9×9 sudoku — the hardest level we make, a pure-logic gauntlet with the bare minimum of clues. Evil grids demand the full toolbox of advanced techniques and real persistence, but they never need a guess: there's exactly one answer to earn. Print it instantly or save the PDF for a serious sitting, or play evil Sudoku online if you'd rather solve on screen.
About this Evil 9×9 sheet
Evil sudoku is the toughest grid we generate, built on the bare minimum of clues a sudoku can have. (No proper sudoku has fewer than 17 given numbers — that's a proven mathematical limit.) Expect to use the full set of advanced techniques and plenty of pencil marks, but never a guess: there's exactly one solution waiting. If it's too brutal, master and expert step it down a notch.
One puzzle per page gives each grid the whole sheet, with large cells and room to write your pencil marks in the margins. It's the most comfortable layout to solve on paper and the easiest on the eyes. Print straight from your browser or save the PDF — it's sized for both A4 and US Letter, so it prints clean wherever you are. Want answers? Toggle the solutions on before you print.
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Frequently asked questions
- How big is the puzzle on a one-per-page sheet?
- It fills the page — one large 9×9 grid with roomy cells, so it's comfortable to read and easy to write pencil marks into. It prints to fit both A4 and US Letter.
- How many clues does an evil sudoku have?
- Evil 9×9 sudoku uses close to the minimum number of clues. No proper sudoku can have fewer than 17 givens — a proven limit — so it leans on advanced techniques, never guessing.
- Can I print the answers too?
- Yes. Toggle solutions on before you print or save the PDF, and the answer key prints alongside your puzzles. Leave it off for a clean sheet — it's free either way, no sign-up.
How to solve these
New to a technique? Read the step-by-step rules and solving guides.
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