Classic sudoku · variant sudoku · hard-puzzle challenges · photo import · step-by-step analysis · technique learning — no ads.
Difficulty rated on the SE and Hodoku scales — every puzzle carries a real difficulty score, so you always know exactly what you're up against.
Hints that teach 70+ techniques — not just which cell to fill, but why. From naked singles to chains, follow how strong players actually think.
Seven difficulty levels, refreshed every day — the same puzzles for everyone worldwide. Finish and climb the daily leaderboard.
Killer, Thermo, Sandwich, German Whispers, Skyscrapers… swap the rules and sudoku is fresh again. Every variant explains its rules in-app.
Seven levels from Easy to Diabolic, refreshed at 00:00 UTC every day. You and every player in the world get the very same puzzles.
A built-in library organized by difficulty, from warm-ups to notorious monsters. And puzzles from elsewhere are welcome too —
Every variant has its own puzzles and rule explanations.
Free to download. No ads to break your concentration.
SudokuFang