Privacy Policy
Last updated: May 26, 2026
Application: Skudo - Sudoku Multiplayer
We respect and are committed to protecting your privacy. This policy describes how we collect, use, store, and protect your personal information when you use the Skudo application, in compliance with international data protection standards such as the GDPR (Europe) and Decree 13/2023/NĐ-CP (Vietnam PDPA).
1. Data We Collect
We follow the principle of Data Minimization, collecting only the information strictly necessary for the game to function:
- Account information: Email and Display Name (collected via Google Sign-In, email with OTP verification, or email and password registration).
- Device information: Device ID and operating system version, used for session management and troubleshooting.
- Game data: Game progress, mistake count, solving time, and hints used (to support progress synchronization).
- Biometric data: Your fingerprint or FaceID is processed locally on your device only for app unlock authentication. We do not collect, store, or transmit this data to our servers.
2. How We Protect and Store Data
We apply strict security standards to protect your data:
- No plaintext storage of Personally Identifiable Information (PII): Identifying information such as Email and Display Name is stored temporarily in memory (in-memory) only while the application is running. We do not persist this information to the device's physical storage.
- Encrypted Tokens & Security Keys: Access Tokens, Refresh Tokens, and Device IDs are encrypted and stored in the operating system's secure enclave (Keychain on iOS, Keystore on Android).
- Encrypted data in transit: All communication with our servers is transmitted over secure connections (HTTPS/WSS).
3. Third-Party Services
Skudo integrates with and shares limited necessary data with the following third-party services:
- Google Sign-In: Used for account authentication. Google may collect data in accordance with Google's Privacy Policy.
- Firebase Crashlytics (Google): To improve application stability, we collect anonymous crash reports (including device information, OS version, and crash context). This data does not contain personally identifiable information and complies with the Firebase Terms of Service.
We do not sell or share your personal data with any other third parties for commercial advertising purposes.
4. User Rights
You have full control over your personal data:
- Right to Consent & Withdrawal: You are asked for consent before we collect behavioral analytics data. You can change this choice at any time in Settings > Privacy > Manage Consent.
- Right to Access & Data Portability: You can download all your personal data and game history in a standard format (JSON) via Settings > Download Data.
- Right to Erasure (Account Deletion): If you no longer wish to use the service, you can delete your account via Settings > Delete Account. All your information on our servers will be permanently removed, and all data stored on your device will also be cleared.
5. Data Retention
- On-device data: Retained until you uninstall the application or perform an account deletion.
- Server data: Retained to maintain your account until you request account deletion. Upon request, data will be permanently erased from our systems.
- Crash reports: Anonymous crash reports are retained for a maximum of 90 days for technical debugging purposes.
6. Contact Us
If you have any questions, concerns, or requests regarding this Privacy Policy, please contact us via email:
Email: skudo@lakwd.net