12 Chess
Privacy Policy
Effective: August 25, 2026
한국어 · English
YT Lab ("we", "the developer") operates the mobile game 12 Chess ("the app").
This policy explains what information the app processes and how.
1. Information we process
The app has no sign-up (no email or phone number). It processes only the following:
| Data | When | Purpose |
|---|
| Anonymous account id (generated by Firebase Anonymous Auth) | First use of an online feature | Keep your online matches and rating on the same device |
| Nickname (set by you, up to 16 characters) | When you set it | Shown to opponents and on the leaderboard |
| Rating and record (Elo score, wins and losses) | When an online match ends | Ranking, and matching you with a similar opponent |
| Match data (moves played, match state) | During an online or friend match | Relaying the match in real time |
| Advertising identifier (IDFA/AAID) and related data | When ads are shown (handled by Google AdMob) | Serving and measuring ads |
We do not collect names, emails, phone numbers, contacts, or precise location.
Practice matches against the AI run entirely on your device.
The anonymous account is a random identifier that does not reveal who you are.
2. Storage
- Online profile and match data are stored and processed on Google Firebase (Realtime Database & Cloud Functions, region: Seoul, asia-southeast1).
- On-device data (settings, mute, mission cache, etc.) stays on your device.
- Weekly league points reset every week; account progress is kept while the service operates.
3. Ads & purchases
- The app shows Google AdMob ads (banner, interstitial, rewarded). AdMob may process advertising identifiers to serve ads.
See the Google Privacy Policy.
- On iOS, personalized vs. non-personalized ads follow your App Tracking Transparency (ATT) choice.
- "Remove Ads" is handled by Apple App Store / Google Play in-app purchase; we never see your payment details.
- In-game chips and stars are score tokens only — they cannot be bought with or exchanged for real money.
4. Sharing
We do not sell your data. It is shared only with the processors above (Firebase, AdMob, the app stores) as needed to run the app, or when required by law.
5. Your rights
- You can change your nickname and avatar in the app at any time.
- To delete your account (the anonymous ID and linked progress), email us below — we will delete it promptly.
- Deleting the app removes all on-device data.
6. Children
The app is not directed at children and does not knowingly collect children's personal information.
7. Contact
8. Changes
Any changes to this policy will be posted on this page.