Privacy Policy for Sūdoku

Last updated: March 2026

Overview

Sūdoku ("the app") is a puzzle game available on iOS. This policy explains what data is collected and how it is used.

Data We Collect

We do not collect any personally identifiable information. The app does not require you to create an account or provide your name, email, or any personal details.

Anonymous identifiers: The app generates a random codename for each device (e.g. "river #4821") used solely to identify players in multiplayer battles. This codename is not linked to your identity and is stored only on your device.

Game data: Your puzzle progress, statistics, and preferences are stored locally on your device only and are never transmitted to our servers.

Multiplayer & Firebase

For online multiplayer battles, the app uses Google Firebase Realtime Database to temporarily store game room data (room codes, puzzle state, and player progress during an active game). This data:

• Contains no personally identifiable information
• Is automatically deleted after games are completed
• Is never used for advertising or analytics

Google's privacy policy applies to Firebase data: https://policies.google.com/privacy

Third-Party Services

• Google Firebase — used for online multiplayer functionality only

Data Retention

No personal data is retained. Multiplayer room data is temporary and deleted after use.

Children's Privacy

The app does not knowingly collect any data from children under 13.