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Effective Date: May 20, 2026

This Privacy Policy explains how the app "Solve Sudoku" (hereinafter referred to as "the app") handles user information. This app complies with Google Play’s User Data Policy and applicable privacy regulations.

1. Information We Collect

The App may collect and process the following information:

1) Account/Authentication (when signing in with Google)

• Required: Firebase Auth UID (internal identifier)
• Optional / Based on Consent: Google account email, display name, profile photo URL (photoURL)
• App-stored data may include: nickname, country code/country name, selected avatar, sign-up/last login date, gameplay metrics (number of game attempts, success rate, average playtime, etc.)

2) Service Usage Records / Device Information (pseudonymized or non-identifiable)

• Usage logs such as button clicks (for app improvement)
• Device information: OS version, device model, app version
• Advertising identifier (Ad ID): used for personalized/non-personalized ads and analytics (AdMob)
• Approximate location data: may be collected by Google Analytics/Crashlytics (no precise GPS location is collected)

2. Purpose of Collection

Collected information is used for the following purposes:

• User authentication and account management (login, profile/ranking synchronization)
• Service delivery, feature improvement, and crash/error analysis