Privacy Policy

Last updated: December 2024

1. Introduction

Welcome to Sudoku Master ("we", "our", or "this app"). This privacy policy explains how we collect, use, disclose, and protect information when you use our mobile app. Please read it carefully. If you do not agree with the terms, please do not use this app.

Important: This app runs fully offline and does not collect, store, or transmit personal information to external servers. All game data is stored locally on your device only.

2. Information We Collect

2.1 Local Data Storage

Sudoku Master is designed for fully offline use. We locally store the following information on your device:

Game records: completed Sudoku puzzle records, including completion time, difficulty, and hints used
Statistics: totals, best time, average time, and perfect completions
Challenge records: daily and timed challenge results and leaderboard data
Settings: preferences such as theme mode, sound, vibration, and error display
Custom difficulty: your configured cells-to-keep value

2.2 No Personal Information Collected

We do not collect, store, or transmit personal information, including but not limited to:

Name, email address, or contact information
Device identifiers (such as IMEI or MAC address)
Location information
Network information
Any other data that can identify you personally

3. How Data Is Used

3.1 Local Processing

All data is processed and used locally on your device for:

Saving your game progress and records
Generating game statistics
Maintaining local leaderboards
Providing personalized settings and preferences
Improving app functionality and user experience

3.2 No Data Sharing

We do not share, sell, or disclose your data to third parties. All data is stored locally on your device, and we cannot access it.

4. Data Security

Because all data is stored locally, security mainly depends on your device settings. We recommend that you:

Back up your device data regularly
Use lock screen protection on your device
Use backup features carefully and keep backups secure

5. Data Deletion

You can delete app data at any time by:

Deleting specific game records in the app
Uninstalling the app to remove all local data
Clearing app data from device settings

Please note that data deletion is irreversible. Once deleted, all records, statistics, and settings will be permanently lost.

6. Children's Privacy

This app is suitable for users of all ages. Since we do not collect personal information, we do not knowingly collect data from children under 13. All data stays local on the device and can be managed by parents.

7. Permissions

This app only requests the following permission:

Vibration permission: used for gameplay vibration feedback (optional and can be disabled in settings)

We do not request or use any other permissions, including network access, location, or contacts.

8. Third-Party Services

This app does not integrate third-party services, analytics tools, ad networks, or data collection services. It runs independently without external service dependencies.

9. Policy Updates

We may update this privacy policy from time to time. Any major changes will be announced in the app. We recommend reviewing this policy regularly. The "Last updated" date at the top reflects the latest version.

10. Contact Us

If you have any questions or concerns about this policy, please contact us at:

Email: support@bolin-culture.com

11. Consent

By using this app, you agree to the terms of this privacy policy. If you do not agree, please do not use this app.