Mahjong Efficiency Privacy policy

Effective: August 1, 2026 (last updated: November 10, 2026)

Information we collect

This app sends a randomly issued anonymous player ID, your rating, the problems you answered, the tiles you chose, whether they matched, your answer times and the positions you analyzed to our server. We do not collect your name, address, email address, advertising ID or location. To improve the app, we also send daily counts of how often you use its features (such as positions analyzed and clears in the Efficiency analyzer, Rate challenge sets, and ads shown) together with the anonymous player ID. These counts contain no hand contents or personal information. For information handled by advertising, see "Advertising". When you create a transfer code, we store a one-way digest of it and its expiry on our server for 30 minutes. It is removed once the code is used or expires. The code itself is never stored.

How we use it

We use it only to deliver problems, grade answers, compute ratings, update answer statistics, run the efficiency analyzer, prevent abuse and improve service quality. We do not use it for tracking or sell it to third parties.

Advertising

This app shows ads through Google AdMob, an ad service of Google LLC. To serve ads, Google may receive device information such as IP address, device type, OS version, how ads were shown or tapped, and the advertising identifier. This app does not use personalized ads. Even for non-personalized ads, Google may use the advertising identifier for frequency capping, fraud prevention and aggregate reporting. On Android this is the Android advertising ID, which you can reset or delete in your device settings; on iOS it is the IDFA. On iOS this app does not ask for permission to track you across apps, so the IDFA is not shared with Google. For how Google handles information, see Google's privacy policy (https://policies.google.com/privacy).

About posts

Posts and author comments of up to 60 characters are published immediately; a post whose comment is flagged by our word lists is withheld until operator review is complete. Completed winning hands cannot be posted. Author names are not public. Objectionable content, personal information and contact details are prohibited. Reported posts immediately leave the public feed and are reviewed within 24 hours. Confirmed violations are deleted; community access is suspended for 24 hours on the first violation, 7 days on the second, and indefinitely from the third. Up to five submissions a day are allowed. Contact: mebaegames@gmail.com.

Information on your device

Your player name, saved hand records and local comments stay on your device. They are not sent to the server unless a feature that you explicitly use sends them.

Retention and deletion

“Delete all data” deletes the anonymous player ID, ratings, answer history, your submissions and local game data. If you cannot delete your data from Settings, email mebaegames@gmail.com with your player number (shown in Settings) to request deletion. A separate random community credential is kept in your device's secure storage: on iOS in Keychain, which may sync according to your iCloud settings; on Android in storage encrypted with the Android Keystore, which is removed when you uninstall the app and is not included in backups. The server stores a one-way hash for terms consent, blocks, hidden posts and violation records. Community records without violations are deleted when you clear all data. For confirmed violations, hashed identifiers, violation counts, identifiers of penalized posts and suspension deadlines are retained as needed to prevent penalty evasion. They are not used for advertising or tracking.

Security

Communication with production uses HTTPS, and administration features are separated from the public app. We do not collect personally identifying information beyond what the service needs.

Changes

If we change what we collect or why, we will update this screen and the privacy information on the App Store and Google Play.