Privacy policy

Last updated: October 2026

Serious Sudoku (the web app at chrisbaumann.ch/serious-sudoku and the Android app) does not collect, transmit or share any personal data.

What is stored on your device

The current game, your settings (default level, appearance) and your solve times (the history) are stored locally on your device, in the browser's local storage or the app's private storage. This data never leaves your device. You can delete it by clearing the site data of the web app, or the storage of the Android app (or by uninstalling it).

What is not done

• No accounts, no login.
• No analytics, tracking or advertising.
• No third-party services; all files of the app are delivered with it.

The app contains links (e.g. to the source code on GitHub). If you open one, the linked website handles your data according to its own privacy policy.

Contact

Questions: open an issue at github.com/chbauman/serious-sudoku or see chrisbaumann.ch.