Privacy Policy
Last updated: October 16, 2026
This document is an English translation provided for convenience. In the event of any discrepancy between this translation and the original Japanese version, the Japanese version shall prevail.
TCM-Labs (the "Operator") establishes this Privacy Policy (the "Policy") regarding the handling of users' personal information in MineTrail (the "App") as follows. For the conditions of use of the App, please also review the Terms of Service.
Article 1 (Information We Collect)
The App may collect the following information:
- User identifiers: A user ID issued through anonymous authentication or a Google / Apple account
- Account information: When signing in with a Google or Apple account, your display name, email address, and profile image URL
- Game data: Information related to game progress, such as scores and play history. Your user name and clear records (clear date and time, clear time, move history, board generation values, etc., used to reproduce replays and for backup) may be stored in Cloud Firestore
- Ranking information: If you take part in the ranking, your user ID, score, sector reached, the date and time of your record and last update, your user name visibility setting and, only while visibility is on, your user name are stored in Cloud Firestore and shown to other users. Viewing and taking part in the ranking is limited to users signed in with a Google or Apple account. Showing your user name can be turned on or off in the settings; while it is off, your name is not stored on the server and is displayed as "****" (off by default). Please do not enter your real name or other personally identifiable information as your user name.
- Usage information: App usage status, access logs, and device information (OS, device type, etc.)
- Advertising identifiers: Identifiers used for ad delivery
Article 2 (Purposes of Use)
The collected information is used for the following purposes:
- Providing, operating, and improving the App
- Saving and syncing users' game data
- Providing the ranking feature
- Delivering advertisements and measuring their effectiveness
- Analyzing App usage
- Preventing fraudulent use
- Responding to user inquiries
Article 3 (Third-Party Services)
The App uses the following third-party services. These services collect and use information in accordance with their respective privacy policies.
- Firebase (Google LLC)
- Firebase Authentication (authentication)
- Cloud Firestore (data storage)
- Firebase Analytics (usage analysis)
- Firebase App Check (prevention of unauthorized access and misuse)
Google Privacy Policy
- Google AdMob (Google LLC)
Google Advertising Policies
Article 4 (Information Management)
The Operator takes necessary and appropriate measures for the security management of collected information, including the prevention of leakage, loss, or damage.
Article 5 (Provision to Third Parties)
The Operator will not provide personal information to third parties without the user's consent, except in the following cases:
- When required by law
- When necessary to protect a person's life, body, or property
- When incidental to the use of the third-party services set forth in Article 3 of this Policy
Article 6 (Data Deletion)
Users can delete their account and all related data by the following methods.
Deleting from within the App (immediate deletion)
- Launch the App and open the settings menu
- Select the "User" tab
- Tap "Delete Account"
- Select "Delete" on the confirmation screen
This operation deletes all account information on Firebase Authentication and, on Cloud Firestore, your ranking record, user profile and clear records. If deletion fails, the process is aborted without deleting the account. Please try again. Once deletion is complete, your user name, clear records, personal bests and ranking visibility setting stored on the device are also erased, and you start fresh as an anonymous user.
If you cannot access the App
If you are unable to access the App, please contact us by email at the address below. After verifying your registered email address, we will delete your data manually.
Article 7 (Children's Privacy)
The App does not knowingly collect personal information from children under 13 years of age. If we become aware that a child under 13 has provided personal information, we will promptly delete that information.
Article 8 (Changes to This Policy)
The Operator may change this Policy as necessary. The revised Privacy Policy shall take effect from the time it is posted in the App or on the website.
Article 9 (Contact)