Support
Having trouble with the app? We're here to help.
Email us at abhinav@abhinavmathur.net and we'll get back to you as soon as possible.
Frequently Asked Questions
Is Sudoku free?
Yes — the app is free to download and play. It is supported by ads.
How do I change the difficulty?
Tap "New Game" from the menu and choose your preferred difficulty: Easy, Medium, Hard, or Expert.
Can I undo a move?
Yes. Tap the undo button in the toolbar to step back through your moves one at a time.
What are notes/pencil marks?
Toggle the pencil icon to switch to note mode. In note mode, tapping a cell enters small candidate numbers to help you think through possibilities.
Does the app collect personal data?
Sudoku does not collect any personal information such as your name, email, or location. Advertising may use your device's advertising identifier (IDFA) if you grant permission via the App Tracking Transparency prompt.
Does it work offline?
Yes. All puzzles are generated on-device and work fully offline. Ads require an internet connection to load.
Privacy Policy
Your privacy is important to us. Read our full Privacy Policy.
In short: Sudoku does not collect personally identifiable information. Ad personalisation only occurs if you grant App Tracking Transparency permission.