Two views. Your Sudoku.
Choose a classic square or the signature 30° Diamond board. Save different portrait and landscape preferences. Turn sideways for a board that uses nearly the full screen height.
Classic & Diamond · iPhone & iPad
Sudoku Duo
Two ways to see Sudoku. One satisfying next move. Choose your board, follow the logic, and discover more with every puzzle.
Download on the App StorePreviously Sudoku: Diamond. Your progress and existing Premium purchase stay with you.
Hints that explain the logic
Follow the evidence, see what can be ruled out, then understand the next move. Step-by-step highlights connect each explanation to the actual puzzle.
Daily and generated puzzles
Choose from six logic-rated difficulties, solve the daily Diamond, or import a puzzle from text or a photo.
Technique Academy
Find the relevant cells and candidates yourself, from singles and pairs to advanced patterns. Optional clues help you learn; independent practice builds mastery.
Progress worth returning to
Collect achievements across solving, daily challenges and learning. See the requirements for your next milestone and jump straight into the matching activity.
Your language, your puzzle
Choose from 50 language and region options in Settings, or follow your device language. Change language without losing your current puzzle.
Offline-first, private sync
Play without an account. Progress stays usable offline and can sync through your private iCloud database when available.
Accessible by design
Dynamic Type, VoiceOver, descriptive row-and-column cell labels, light and dark themes, and complete iPhone and iPad layouts are built in.
Support and accessibility feedback
Tell us about a puzzle, translation, purchase, sync, accessibility, or display issue. Please do not include sensitive personal information.
[email protected]Premium and advertising
Every puzzle, difficulty, lesson, hint, and import feature is available to free players. The free experience may show portrait banners and a post-game interstitial. A restorable, one-time Lifetime Premium purchase removes those ads. No subscription.
Quick help
- If a saved game does not appear, confirm that iCloud Drive is available, then reopen the app. Local play remains available while iCloud is offline.
- For purchase issues, open Settings and use Restore Purchases with the Apple Account used for the original purchase.
- When reporting a puzzle issue, include the difficulty, puzzle source, device model, iOS or iPadOS version, and app version when possible.
- You can remove local and iCloud-synced Sudoku progress from Settings → Privacy & data → Delete all personal data.