Privacy Policy

Last updated: June 9, 2026

This page explains what information Cosmic Sudoku ("we", "the site", at cosmicsudoku.com) collects and how it is used. We keep this deliberately simple, because the site itself is simple.

No accounts, no personal data we hold

Cosmic Sudoku does not require you to create an account, and we do not ask for your name, email address, or any other personal information to play. Your game progress — completed levels, streaks, stats, settings, and daily hint count — is stored locally in your own browser using localStorage. It stays on your device, is not transmitted to us, and you can clear it at any time through your browser settings.

Analytics

We use Google Analytics 4 to understand general, aggregated usage — for example how many people visit and which levels are popular. This helps us improve the game. Google Analytics may set cookies and process information such as your approximate location, device, and browser. We do not use it to identify you personally. You can learn more in Google's Privacy Policy, and you can opt out using the Google Analytics Opt-out Browser Add-on.

Advertising

Cosmic Sudoku displays ads through Google AdSense to keep the game free. Please note the following:

• Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites.
• Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to our site and/or other sites on the Internet.
• You may opt out of personalised advertising by visiting Google Ads Settings. You can also opt out of some third-party vendors' use of cookies for personalised advertising at aboutads.info/choices or youronlinechoices.eu.

If you are in a region covered by the GDPR or similar laws, our advertising partners may present a consent message regarding the use of cookies and data for personalised advertising.

Cookies

Cookies are small text files stored by your browser. On this site they are used by the Google Analytics and Google AdSense services described above. You can control or delete cookies through your browser settings; disabling them will not stop you from playing the game.

Children

Cosmic Sudoku is a general-audience puzzle game and is not directed at children under 13. We do not knowingly collect personal information from children.

Payments and tips

Supporting the game through "Buy Me a Coffee" is optional and handled entirely on Buy Me a Coffee's own platform. We never see or store your payment details. See Buy Me a Coffee's Privacy Policy for how they handle your information.

Changes to this policy

We may update this Privacy Policy from time to time. Material changes will be reflected by the "Last updated" date above.

Contact

Questions about this policy? Reach us via our contact page.