Privacy Policy

Doomsday Trainer  ·  Inefficient Code  ·  Last updated: March 2026

Doomsday Trainer is a mental-math training app built by Inefficient Code. This policy explains what information the app collects, how it is used, and your choices.

1. Information We Collect

Local Game progress & settings

Your high scores, game history, and app settings (theme, sound preferences) are stored locally on your device only using the device's standard local storage. This data never leaves your device unless you opt in to Google Play Games cloud saves (Android only).

Analytics Anonymous usage data (Firebase Analytics)

We use Firebase Analytics (Google) to collect anonymous, aggregated data about how the app is used. This includes:

• Which screens are viewed
• When a game is started or ended
• Streak length at game over
• Which game modes are used

No personally identifiable information (name, email, location, device ID) is collected. Data is used solely to understand feature usage and improve the app. You can review Google's data practices at policies.google.com/privacy.

2. Optional Third-Party Services

Optional Google Play Games Services (Android)

If you choose to connect via the Settings screen, Google Play Games is used to:

• Display your username in-app
• Submit scores to global leaderboards
• Back up your high scores to the cloud

This service is entirely optional, requires your explicit action to enable, and is governed by Google's own privacy policy. You can disconnect at any time from the app's Settings screen.

3. What We Do NOT Collect

• No name, email address, or contact information
• No precise or approximate location
• No camera, microphone, or contacts access
• No advertising identifiers
• No data is sold or shared with third parties for marketing

4. Children's Privacy

Doomsday Trainer does not knowingly collect personal information from children under 13. The app contains no ads, no in-app purchases, and no social features.

5. Data Retention & Deletion

Local game data can be deleted at any time by uninstalling the app. Anonymous Firebase Analytics data is retained by Google for up to 14 months per their standard policy. We do not have a way to identify or delete individual anonymous records.

6. Changes to This Policy

We may update this policy from time to time. The "last updated" date at the top of this page will reflect any changes. Continued use of the app after changes constitutes acceptance of the updated policy.

7. Contact

Questions about this privacy policy? Email us at inefficientcode@gmail.com.