Privacy

Cat Sudoku does not ask for an account, a name, or an email address. Puzzle progress, the timer, hints, and the daily streak are saved in local storage in your browser. That data stays on your device. Clearing site data for this site removes it.

Google Analytics loads only if the site operator sets the environment variable NEXT_PUBLIC_GA_ID to a GA4 measurement id before building the site. When that id is empty, no analytics script is requested. If it is set, the script is Google’s gtag and the site asks it to anonymize IP addresses. You can also block it with your browser.

The site does not show ads unless the operator builds it with NEXT_PUBLIC_ADS_ENABLED set to true. No advertising script is included in the default build. The site does not sell personal information, and it does not run a contact form. To reach us, email hello@cat-sudoku.com. We only use what you send to reply to you.