Evil Sudoku

The hardest free Sudoku on the web — play evil, expert, hard, impossible and the world’s hardest, all in your browser.

No mercy, no filler difficulties — this is the site for solvers who want the toughest puzzles, free and instant, with no signup.

Play an evil puzzle nowAbout evil Sudoku

Play an evil Sudoku puzzle

Today’s evil puzzle

A fresh, date-seeded evil board lands every day — the same puzzle for everyone, so you can compare your time. Come back daily to keep the streak going.

Play today’s evil Sudoku

Pick your difficulty

Five tiers, from hard up to the world’s hardest. Start where you like and climb toward evil.

FlagshipEvil SudokuOur flagship tier — the hardest 9×9 we generate. Chains and fish required.Play Evil Sudoku→Impossible SudokuEvil-grade puzzles at their most punishing. For the relentless.Play Impossible Sudoku→Hardest SudokuThe toughest boards on the site — including the famously hard ones.Play Hardest Sudoku→Expert SudokuA serious step up from hard — a warm-up for evil.Play Expert Sudoku→Hard SudokuWhere the real challenge starts. The entry rung of the ladder.Play Hard Sudoku→

Why play here?

  • Difficulty-first

    The whole site is built around the hardest tiers — evil isn’t buried under twelve easier levels.

  • Free, no signup

    Every puzzle is free and plays instantly in your browser. No account, no paywall.

  • One unique solution

    Every board we serve has a single, unique solution — properly generated, never a broken puzzle.

  • A real ladder

    Step up or down between hard, expert, evil, impossible and the hardest — at your own pace.

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