Privacy Policy

Effective date: September 11, 2026

Sudoku Royale is a classic sudoku app with optional live matches, published by Rabbit Slims Limited ("we", "us"). Rabbit Slims Limited is the data controller for the personal data described in this policy. This policy explains what data we collect, how we use it, and your rights.

1. What we collect

Account data

When you first open the app, an account is created automatically using a random device identifier. No email address or password is required. You can optionally set a username, which is displayed on the public leaderboard.

You can also choose to link an email address and password, or use Sign in with Apple, so you can recover your account on another device. If you do, we store that email address (with Sign in with Apple, this may be Apple's private relay address) to sign you in and to send password reset emails.

Gameplay data

We store data about your performance: skill rating, games played, wins, losses, best scores, match accuracy, and match history (opponents, scores, timestamps). This data is tied to your device-generated account.

Push notification tokens

If you allow push notifications, we store your APNs device token on our server so we can send you game-related notifications (friend requests, match invites, lobby announcements). You can disable notifications at any time in your device settings, and the token will no longer be used.

Crash reports and diagnostics

We use Sentry (sentry.io) for crash reporting. When the app crashes, Sentry collects technical information about the crash: device model, OS version, app version, and a stack trace. Crash reports are not linked to your game account or gameplay data. On-device diagnostic logs use Apple's OSLog and are not sent to our servers.

Usage analytics

We collect anonymous usage events to improve the game: app opens, screen views, match starts, match completions, and connection errors. These events are stored on our own servers (not sent to third parties) and are tied to your device-generated account. We do not track you across other apps or websites.

Install attribution

We use Apple's AdServices framework to learn whether you installed the app from an Apple Search Ads campaign. The app sends a short-lived attribution token to our server, which asks Apple for the campaign details. This uses no advertising identifier and does not track you across other apps or websites.

What we do not collect

We do not collect your real name, location, contacts, photos, financial information, or health data. We do not use advertising identifiers or cross-app tracking. We do not sell or share your data with advertisers.

2. How we use your data

To create and maintain your game account
To calculate rankings and display the public leaderboard
To match you with opponents and record game results
To send push notifications about friend requests, invites, and match events
To track anonymous usage patterns and improve the game experience
To sign you in and send password reset emails, if you link an email address
To measure which Apple Search Ads campaigns bring in new players
To detect and fix crashes via Sentry

3. What is public

Your username and skill rating appear on the public leaderboard. If you have not set a username, a default identifier is shown. No other account data is publicly visible.

4. Third parties

We do not sell your personal data. We do not share it with advertisers. We may share data only in the following cases:

With our infrastructure provider (Hetzner Cloud) to host the game servers
With Apple Push Notification service (APNs) to deliver push notifications
With Sentry (sentry.io) for crash reporting. Sentry receives technical crash data only (device model, OS version, stack trace). No gameplay data or account information is sent to Sentry.
With Resend (resend.com) to send password reset emails, if you have linked an email address
With Apple, to provide Sign in with Apple and Apple Search Ads attribution
When required by law or valid legal process

5. Where your data is stored

Our servers are hosted on Hetzner Cloud in Falkenstein, Germany. All game data is stored and processed in the European Union.

6. Data retention

Your account data is kept for as long as your account exists. If you request account deletion, we remove your personal data within 30 days. Anonymized, aggregated statistics (like total cells solved globally) may be kept indefinitely.

7. Account deletion

You can delete your account directly in the app by going to Profile → Settings → Delete Account. You can also request deletion by emailing support@sudoku-royale.com. Deletion is immediate when done in-app, or within 30 days when requested by email. Once deleted, your gameplay history, stats, and leaderboard entries are permanently removed.

8. Children's privacy

Sudoku Royale is not directed at children under 13. We do not knowingly collect personal data from children under 13. If you believe a child under 13 has used the app, please contact us at support@sudoku-royale.com and we will delete the account.

9. Your rights

You can request at any time to:

Access the personal data we hold about you
Correct inaccurate data
Delete your account and all associated data
Export your data in a portable format

To make a request, email support@sudoku-royale.com.

10. Changes to this policy

We may update this policy from time to time. If we make material changes, we will notify you through the app. Continued use of Sudoku Royale after changes constitutes acceptance of the updated policy.

11. Who we are and how to contact us

Sudoku Royale is operated by Rabbit Slims Limited, a company registered in England and Wales (company number 17195943). Registered office: Flat 74, 98 Camley Street, London, N1C 4EF, United Kingdom.

Questions about this policy? Email us at support@sudoku-royale.com.