Privacy Policy - Sudoku Zen Master

Last Updated: January 07, 2026

This Privacy Policy applies to the mobile application Sudoku Zen Master ("App"), developed by Pham Dai Nghia and owned by DNTV ("we," "us," "our"). This policy describes our practices regarding the collection, use, disclosure, and protection of users' ("you") information.

Core Principle: We are committed to data transparency. For Sudoku Zen Master, we prioritize a "Zen" experience, meaning we collect only the minimum data necessary to provide game functionality, social features (PvP), and service improvements.

1. Information We Collect

1.1 Information You Provide Directly

  • Account Information: User ID, display name, and profile information if you link via third-party services (Google Play Games/Game Center) for premium features or leaderboard sync.
  • Transaction Information: Details of your in-app purchases (e.g., date, items purchased). Note: We do not store full payment card info; this is handled by Google/Apple.
  • Support Information: Information provided when contacting us via support email.

1.2 Information Collected Automatically

  • Device Information: IP address, device type, manufacturer, OS version, Advertising ID (GAID/IDFA), and language settings.
  • Gameplay Data: Difficulty levels played, completion times, mistakes made, hints used, and scores (for local and PvP leaderboards).
  • Usage Data: Interaction details with App features, session duration, and frequency.
  • Diagnostic Data: Crash logs and performance reports (via Firebase Crashlytics).

1.3 Sensitive Data via Permissions

PermissionBasisSpecific Purpose & Justification
Internet / WiFi StateSystem DefaultRequired for PvP Friend Mode and real-time synchronization of game states between players.
In-App PurchasesUser ActionTo enable the purchase of Ad-Free versions or special game items.

2. Legal Basis and How We Use Information

We process data based on the following legal grounds:

  • Contract Performance: To provide the services you request (PvP matchmaking, game synchronization).
  • Legitimate Interests: To improve game logic, prevent cheating in PvP, and perform internal analytics.
  • Legal Compliance: To meet statutory obligations.
  • Consent: For specific purposes like Push Notifications or targeted advertising.

3. Sharing and Disclosure

We do not sell or rent your personal information. We only share data with:

  • Service Providers: Google Firebase (Analytics/Database), Google AdMob (Advertising), and Hosting providers.
  • Legal Authorities: When required by law or to protect the safety of DNTV, our users, or the public.
  • Business Transfers: In the event of a merger or asset sale.

4. Cookies and Tracking Technologies

The App and our partners (e.g., AdMob) use mobile advertising IDs and similar technologies to analyze trends, manage the App, and deliver personalized content. You can control these via your device's "Privacy" settings.

5. International Data Transfers

Your information may be processed in countries where our service providers operate, including outside of your home country. We implement standard contractual clauses to ensure your data remains protected.

6. User Rights

Depending on your location, you may have the right to:

  • Access and receive a copy of your data.
  • Request correction of inaccurate data.
  • Request deletion of your data ("Right to be Forgotten").
  • Object to or restrict data processing.
  • Withdraw consent at any time.

7. Children's Privacy

Sudoku Zen Master is a general audience app. We do not knowingly collect personal data from children under 13. If we discover such data has been collected, we will delete it immediately.

8. Changes to This Policy

We may update this Privacy Policy periodically. We will notify you of significant changes by posting the new policy in the App and updating the "Last Updated" date.

9. Contact Information

If you have questions regarding this policy, please contact us:

Developer Entity: DNTV
Lead Developer: Pham Dai Nghia
Email:contact@dntv.vn