Privacy Policy — Numina: Math & Brain Games

Last updated: 11 October 2026

1. Scope

This policy covers Numina: Math & Brain Games (Android package app.numina.numina), published on Google Play by LudicCraft. It describes this app only. Our website and our other apps are covered by the LudicCraft privacy policy.

2. In short

Numina: Math & Brain Games is free and funded by advertising. To show ads, Google AdMob processes data about your device and your interactions with the ads; the app also measures its audience with Google Analytics for Firebase. Section 3 lists exactly what is collected, as its Google Play “Data safety” section declares it. We do not sell your data, and the app asks for no account and no real identity.

The app contains:

  • no crash-reporting service;
  • no account, no sign-in and no online leaderboard.

3. Data collected (“Data safety”)

Here is exactly what the Google Play “Data safety” section of Numina: Math & Brain Games declares, category by category. Nothing else is collected.

  • App activity — App interactions: collected, and shared with Google AdMob. The ads shown, your clicks on them and how often they appear, reported to Google AdMob; how you use the app, measured by Google Analytics for Firebase (see “Audience measurement”). Purposes: advertising, analytics and fraud prevention.
  • Device or other IDs — Device or other IDs: collected, and shared with Google AdMob. The Android advertising ID and the App Set ID, used by Google AdMob; the Firebase installation ID. Purposes: advertising, analytics and fraud prevention.
  • App info and performance — Diagnostics: collected, and shared with Google AdMob. Technical data on ad requests (latency, SDK errors, device state). Purposes: advertising, analytics and fraud prevention.
  • Location — Approximate location: collected, and shared with Google AdMob. Inferred from your IP address by Google AdMob to estimate your region (country, city), never an address. Purposes: advertising, analytics and fraud prevention.

Data is encrypted in transit (HTTPS/TLS). You can ask us to delete it on our data deletion page. We do not sell your personal data.

4. What stays on your device

The app keeps on your device your progress, your settings and whether the “remove ads” option is active. None of it is sent to us.

On Android, your device's own backup service (Android Auto Backup) may include this local data in the backup of your device to your Google account, like your other apps' data. That backup is yours: it is encrypted in your Google account, controlled in your device settings (Settings › Google › Backup) and invisible to us. If it is off, uninstalling the app deletes everything.

5. Advertising

Numina: Math & Brain Games shows ads provided by Google AdMob, our only advertising partner: no other ad network is built into it. To choose ads, limit how often they repeat, measure their display and prevent fraud, the Google AdMob SDK processes your device's advertising ID and the App Set ID, your IP address (from which Google infers an approximate region, never an address), technical information about your device (model, system version, language) and your interactions with the ads. Google processes this data under its Privacy Policy.

In the European Economic Area, the United Kingdom and Switzerland, the app shows you a consent form (Google UMP) and sends no ad request until you have answered it. If you refuse that information be stored on or read from your device, it sends none either: refusing prevents advertising instead of merely depersonalising it. If you accept that storage but refuse personalisation, the ads are non-personalised.

You can change this choice at any time from the privacy option in the app's settings, offered wherever the choice applies.

Elsewhere, ads may be personalised. You can reset or delete your advertising ID at any time in your device settings (Settings › Google › Ads).

6. Audience measurement

Numina measures its audience with Google Analytics for Firebase only if you consent: collection is off when the app starts and turns on only if the consent form allows it — the same decision as for advertising, and withdrawing it from the settings turns it off again. Outside the European Economic Area, the United Kingdom and Switzerland, where no form is required, it is on. It records usage events: games started, finished or abandoned, tutorials completed, daily challenge played and current streak, ads shown, reminder choices.

This measurement relies on a Firebase installation ID, which is not linked to your identity. This data is not shared: Google processes it on our behalf and keeps it for 14 months at most (Firebase privacy and security).

7. Reminders

Numina can remind you every day, around 7 pm, that its daily challenge is waiting, and send you on Sundays, around 6 pm, a summary of your week. These reminders are optional and stay off until you turn them on; turning them off removes both. These notifications are scheduled and shown by your device itself: nothing is sent to us or to Google, and no server is involved. Turning them off in the app's settings stops them immediately.

8. In-app purchases

Numina: Math & Brain Games offers an optional paid option that removes the ads shown automatically. The transaction is handled end to end by Google Play Billing, and Google Play processes the data it needs — payment, receipt, refund — as an independent controller under the Google Privacy Policy. We neither receive nor store your payment information: on your device, the app only knows that the option is active.

9. Third-party services

The third parties involved are:

  • Google AdMob — advertising (Privacy Policy)
  • Google Firebase — Analytics (privacy and security)
  • Google Play — purchases, through the Google Play app on your device

No other third party receives data from the app.

10. Retention

  • Usage and crash data: kept by Google for 14 months at most.
  • Advertising data: processed and kept by Google under its own policies; we do not store the advertising ID.
  • The app's data (your progress, your settings and whether the “remove ads” option is active): stored on your device only, as long as the app is installed.
  • Purchase receipts: kept by Google under its accounting obligations.
  • Messages to our support: kept 3 years after they are resolved.

11. International transfers

Your data may be transferred to and processed in countries other than your own, in particular by Google. We make sure such transfers comply with applicable law, in particular through standard contractual clauses approved by the European Commission.

12. Children

Numina: Math & Brain Games is not enrolled in Google Play's “Designed for Families” programme and is intended for players aged 13 and over. We do not knowingly collect personal data from children under 13. If you are a parent and believe your child has sent us personal data, contact us at contact@ludiccraft.com and we will delete it.

13. Your rights

Under the GDPR and similar laws, you have the right to access, rectify, erase, restrict, port and object to the processing of your personal data, and to withdraw your consent at any time — for advertising, from the privacy option in the app's settings. To exercise these rights, write to contact@ludiccraft.com or use our data deletion page. You may also complain to your data protection authority (in France, the CNIL).

14. Changes

Any change to what this app does with data is made here and in its Google Play “Data safety” section at the same time, before the version concerned is published. The date at the top of this page shows the current version.

15. Contact

LudicCraft — contact@ludiccraft.com — www.ludiccraft.com