Daily puzzles
Open Today, choose Classic 9×9 or Grand 16×16, then pick Easy, Medium, Hard, or Expert. A new set appears when your local calendar day changes.
Quick answers
Play at your own pace
Notes and hints
Select an empty cell and turn on Notes before entering candidates. Hint reveals one value and adds it to your hint count.
Progress and timing
Your place is saved automatically. Relaxed mode keeps the timer optional; Time Challenge records personal bests for each size and difficulty.
Board and appearance
Open Settings to choose a preferred board size, conflict highlighting, haptic feedback, timer visibility, and light or dark appearance.
Troubleshooting
If something is not working
- Close and reopen Sudoku.This resolves many temporary display or navigation issues without affecting saved progress.
- Check for updates.Install the latest Sudoku version from the App Store and update iOS or iPadOS when available.
- Restart your device.Then open the same puzzle and try the action again.
- Send us the details.Include your device model, system and app versions, board size, difficulty, and the steps that led to the issue.
Reinstalling Sudoku removes locally stored puzzles, history, streaks, personal bests, and settings. Try the steps above or contact us before deleting the app.
Privacy and saved data
Your practice stays on your device
Sudoku does not require an account or connect to a backend. Daily puzzles, solutions, progress, history, settings, and statistics are generated and stored locally. The app contains no advertising, analytics, or third-party tracking.
Deleting the app also deletes its locally stored data. Sudoku does not currently sync progress between devices.
Contact
Still need help?
Send questions, feedback, accessibility concerns, or feature requests to:
chitokapp2026@gmail.com