How to play Evil Sudoku
- Evil mode: around 22 givens — the most extreme sudoku difficulty.
- Pencil notes are mandatory here — chains and eliminations everywhere.
- Only 3 mistakes allowed. Complete the 9×9 grid to conquer evil.
Evil Sudoku is free to play online at Trivio — no download, no signup, works on desktop and mobile. Your best score is saved in your browser.