Math Crossword

Last updated: 22 October 2026

This Privacy Policy describes how the Math Crossword Android application (the "App", package name com.mathcrossword.game) handles information. The App is published on Google Play by Zharko Maslarski (the "Developer", "we"). By using the App you agree to the practices described here.

1. Summary

- The App does not require an account and does not ask for your name, e-mail address, phone number or contacts.
- The App contains no advertising and no advertising SDKs.
- The only information sent from your device is an anonymous leaderboard entry (a random player ID, the nickname you choose, your score and a timestamp) and, if you buy something, the purchase data handled by Google Play.
- Your game progress is stored on your device.

2. Information stored only on your device

Game progress (unlocked levels, stars, coins, hints, hearts, trophies, daily-goal progress), your difficulty selection and your settings (music, sound effects, vibration) are saved in the App's private storage on your device. This information never leaves your device and is deleted when you uninstall the App or clear its data.

3. Leaderboard (Google Firebase / Cloud Firestore)

The App has an optional global leaderboard. To show it, the App stores and reads the following in a Cloud Firestore database operated by Google Firebase on our behalf:

- Player ID: a random identifier generated by the App on first launch. It is not linked to your Google account, device ID or any personal detail.
- Username: the nickname shown on the leaderboard. The App assigns a default such as "Player-1A2B"; you can change it at any time on the Leaderboard screen. Please do not use your real name or other personal information as a nickname — anything you enter there is visible to all players.
- Score and the time of your last update.

No other data is uploaded. Google processes this data as our processor according to the Firebase terms (https://firebase.google.com/terms and https://firebase.google.com/support/privacy). Data may be stored on Google servers outside your country.

4. Purchases (Google Play Billing)

The App offers optional one-time in-app products (extra hearts, hint packs and the "Unlimited Hearts" unlock). There are no subscriptions. Payments are processed entirely by Google Play; we never receive or store your payment card details, name or address. The App receives only a purchase token and signature from Google Play to verify the purchase and unlock the item on your device. Google Play's handling of your data is described in Google's Privacy Policy (https://policies.google.com/privacy). Refunds are handled according to Google Play's refund policy.

5. In-app review

After completing a puzzle the App may show Google Play's built-in "rate this app" card. This is provided by Google Play; any rating or review you submit is handled by Google under Google's Privacy Policy and the App does not receive your identity.

6. Permissions and automatically collected data

The App requests the INTERNET permission (for the leaderboard and Google Play Billing) and the Google Play billing permission. It does not access your location, camera, microphone, contacts, photos or files.

Google Play and the Android system may collect crash reports, device model, OS version and similar diagnostic data and show them to the Developer in aggregated form through the Google Play Console. The App itself does not include analytics or crash-reporting SDKs.

7. Cookies

The App does not use cookies.

8. Children

The App is a general-audience maths puzzle game and is not directed at children under 13. It does not knowingly collect personal information from children. If you believe a child has entered personal information as a leaderboard nickname, contact us and we will delete it.

9. Data retention and deletion

Local data is kept until you uninstall the App or clear its data. Leaderboard entries are kept while the leaderboard operates. To have your leaderboard entry deleted, change your nickname to something neutral in the App, or contact us with your nickname and we will remove the entry within 30 days.

10. Security

Leaderboard data is transmitted over encrypted HTTPS connections and stored on Google's infrastructure. No method of transmission or storage is 100% secure, but we use commercially reasonable means to protect the limited data the App handles.

11. Your rights

Depending on where you live (for example under the GDPR in the EU/EEA), you may have the right to access, correct or delete personal data we hold about you. Because the only identifier we store is the random Player ID and your chosen nickname, please include your nickname in any request so we can locate your entry.

12. Changes to this policy

We may update this Privacy Policy from time to time. The current version is always available at this address, and material changes will be reflected in the "Last updated" date above.

13. Contact

For questions or requests regarding this Privacy Policy, contact the Developer at: zarko612@gmail.com