Sudoku Corner — The Ultimate Sudoku Challenge Platform

1. Who We Are

Michal Repasek Software ("we", "us", "our") operates the Sudoku Corner web application. Our registered address is: Dlouha 162, 25063 Mratin, Czech Republic.

2. What Data We Collect

We collect the minimum data necessary to provide the service:

Account dataNickname, email address, hashed password

Game dataMatch results, scores, ELO ratings, solve times

Technical dataIP address, browser type (for security and abuse prevention)

CookiesSession cookie (required), analytics cookie (optional, see below)

We do not collect payment information, location data, or data from third-party social logins.

3. How We Use Your Data

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).

If you consent to analytics cookies, we use Google Analytics to understand how the application is used in aggregate (page views, feature usage). This helps us improve the service. No personal gameplay data is sent to Google.

4. Legal Basis (GDPR)

For users in the European Economic Area, our legal bases are:

ContractProcessing necessary to provide the service you signed up for

Legitimate interestSecurity, abuse prevention, service improvement

ConsentAnalytics cookies (optional, revocable at any time below)

5. Cookies

We use the following categories of cookies:

Essential cookies Session management, CSRF protection, login persistence. These are required for the application to function and cannot be disabled.

Analytics cookies Google Analytics (G-EZKFZEWM3S) — collects anonymized usage statistics. Optional, only active if you consent.

6. Manage Your Cookie Consent

You can review and change your cookie preferences at any time:

7. Data Sharing

We do not sell or share your personal data with third parties for marketing purposes. Data may be shared with:

Google AnalyticsOnly if you consent to analytics cookies

Hosting providerServer infrastructure (data processing agreement in place)

Law enforcementOnly if required by applicable law

8. Data Retention

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.

9. Your Rights

Depending on your jurisdiction (GDPR, CCPA), you have the right to:

AccessRequest a copy of your personal data

RectificationCorrect inaccurate data via Settings

DeletionRequest deletion of your account and data

PortabilityReceive your data in a structured format

Withdraw consentRevoke analytics cookie consent above

To exercise these rights, contact the service operator.

10. Children

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.

11. Changes to This Policy

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.

Privacy Policy