Last updated: 2026-03-04
Michal Repasek Software ("we", "us", "our") operates the Sudoku Corner web application. Our registered address is: Dlouha 162, 25063 Mratin, Czech Republic.
We collect the minimum data necessary to provide the service:
We do not collect payment information, location data, or data from third-party social logins.
Your data is used to operate the game: authenticate your account, match you with opponents, calculate ratings, display leaderboards, and send notifications you've opted into. Technical data is used to prevent abuse (rate limiting, ban enforcement).
For usage statistics we run a self-hosted analytics tool (Umami) on our own infrastructure. It is cookieless, collects only anonymized, aggregated data (page views, referrers, device type), and no data ever leaves our servers or is shared with any third party.
For users in the European Economic Area, our legal bases are:
We use only essential (technical) cookies:
We do not use any advertising, tracking, or third-party cookies. Our analytics (self-hosted Umami) works entirely without cookies. Because only strictly necessary cookies are used, no cookie consent banner is required.
We do not sell or share your personal data with third parties for marketing purposes. Data may be shared with:
Account data is retained as long as your account is active. If you delete your account, personal data is removed within 30 days. Anonymized game statistics may be retained indefinitely. Server logs are retained for up to 90 days.
Depending on your jurisdiction (GDPR, CCPA), you have the right to:
To exercise these rights, contact the service operator.
Sudoku Corner is not directed at children under 13. We do not knowingly collect data from children under 13. If you believe a child has provided us with personal data, please contact us.
We may update this policy from time to time. Material changes will be communicated via a notification on the platform. Continued use after changes constitutes acceptance.