Preparing your puzzle…
Keyboard: 1–9 to enter · N for notes · arrows to move · ⌘/Ctrl+Z to undo.
Collection puzzles use published difficulty ratings. Generated puzzles are graded by the deductions needed to solve them.
8,000 rated, uniqueness-checked puzzles. No downloads needed.
Your current puzzle is replaced only when the new one is ready.
System follows your device. Scheduled uses your local clock, never your location.
Strike limits apply to new games. Your current game's rules stay consistent.
Notes are manual by default. Assistance uses only the current board, never the hidden solution. Undo restores the entire move.
Free, open source, and offline-ready. No ads. No tracking. No accounts. 8,000 collection puzzles courtesy of Grant McLean / Sudoku Exchange, generated with QQWing and rated with Sukaku Explainer. Public domain. Browser and native saves are separate.