Clean, elegant Sudoku with zero ads. Smart hints, unlimited puzzles, and a beautiful design. Free on iPhone & iPad.
Algorithmically generated puzzles — every game is unique. Three difficulty levels to match your mood.
Intelligent hint system: first shows notes, then reveals the answer. Learn as you play.
Auto-updating notes that clear themselves when you place a digit. Like paper, but smarter.
See mistakes instantly. Row, column, and block highlighting keeps you on track.
Beautiful minimalist design in both modes. Easy on the eyes, day or night.
English, Русский, Deutsch, Español, Українська, and Português. Switch anytime, no restart.
Having trouble or have a question? We're here to help. Reach out and we'll get back to you as soon as possible.
Before contacting support, try restarting the app or updating to the latest version from the App Store.
✉️ y@bookoff.meLast updated: February 9, 2026
Sudoku Brain ("the App") is developed by Bookoff. Your privacy is important to us. This policy explains what data we collect and how we use it.
Sudoku Brain does not collect, store, or transmit any personal data. All game data, progress, and settings are stored locally on your device and are never sent to any server.
We do not use any third-party analytics, tracking, or advertising frameworks. There are no ads in the app.
Subscriptions and purchases are processed entirely by Apple through the App Store. We do not have access to your payment information.
The app may request permission to send local notifications (e.g., when your next puzzle is ready). These notifications are generated locally on your device and are not sent from any server. You can disable them at any time in your device settings.
The app does not knowingly collect information from children. It is rated 4+ and contains no objectionable content.
We may update this policy from time to time. Any changes will be posted on this page with an updated date.
If you have any questions about this Privacy Policy, contact us at sudoku@bookoff.me.