Labyrinth of ProbabilityPersonal Data Handling
Fuji Bit Inc. ("we", "us") handles personal information (including personally related information) in the mobile app "Labyrinth of Probability" (Japanese title: 確率迷宮; iOS / Android; the "App") in accordance with Japan's Act on the Protection of Personal Information and other applicable laws, as set out below. This page supplements the Privacy Policy and lists the data we handle, when it is collected, why, where it is sent, how long it is kept, and your rights. If this English version and the Japanese version differ, the Japanese version prevails.
You can play the App without creating an account. Joining the online leaderboards, linking an account and personalized ads are all optional, and every game feature remains available if you choose none of them. In v4.0.0 we switched our ad provider from Google AdMob to Pangle and stopped using Google AdMob.
1. Business operator
- Name: Fuji Bit Inc.
- Contact for personal information: support@fujibit.com
- Address and representative's name: provided without delay upon request.
2. Data we handle and when it is collected
| Data | When collected | Purpose | Stored at / sent to | Retention |
|---|---|---|---|---|
| Nickname (1-16 characters) | When you register a nickname after agreeing to join the leaderboards ("Random" can generate one) | Display on the leaderboards | Google Firebase (Cloud Firestore). Shown publicly to other players viewing the leaderboards | Until your account is deleted |
| Leaderboard results (best score, rank, rooms reached, whether you cleared, number of smart calls, total plays, total clears, update time) | When you finish a run after joining the leaderboards | Compiling and displaying the leaderboards | Google Firebase (Cloud Firestore), per mode and per period (the Daily Labyrinth is daily only). Shown publicly to other players | Until your account is deleted |
| Firebase anonymous authentication ID (UID) | When you agree to join the leaderboards (issued automatically by Firebase Authentication) | Linking leaderboard records to you and preventing others from overwriting them | Firebase Authentication, Cloud Firestore | Until your account is deleted |
| Linked account information (Apple / Google account identifier, email address) | Only if you choose to link an account on the account linking screen (Apple ID or Google on iOS, Google on Android) | Carrying your records to another device, identity verification | Firebase Authentication. Not shown on the leaderboards or to other players | Until you unlink or your account is deleted |
| Advertising data (Android advertising ID; iOS IDFV, and IDFA only if you allow tracking; IP address and approximate location; device information; ad interaction data; diagnostics such as crash and performance data) | When ads are shown, after you answer the ad choice (the ATT dialog on iOS, the two-option screen at first launch on Android). Collected directly by the Pangle SDK. Not collected if you purchased "Remove Ads" | Ad delivery, measurement and fraud prevention. Personalized ads only with your consent | Pangle (Bytedance Pte. Ltd., Singapore) | As set out in Pangle's privacy policy |
| Purchase information | When you buy or restore "Remove Ads" or "Master Labyrinth" | Granting purchased items and restoring purchases | Payments are processed by Apple (App Store) / Google (Google Play). We do not obtain payment information. Purchase state is stored on the device only | On device: until you delete the App. Stores: per each store's policy |
| On-device game data (score history, BGM mute, ad choice, leaderboard consent, hint display state, the date you last played the Daily Labyrinth for the record) | During play | Running the game and showing your records | On the device only (UserDefaults on iOS, SharedPreferences on Android). Not sent anywhere | Until you delete the App |
| Inquiries (email address, message) | When you contact us by email | Answering inquiries, handling requests, identity verification | Our email system | As long as needed to respond |
The App does not ask for your name, address, phone number or device location (GPS). Your nickname is public on the leaderboards, so please do not use your real name or anything that identifies you.
3. Purposes of use
- Providing the App's game features
- Compiling and displaying the online leaderboards
- Carrying records over and verifying identity through account linking
- Delivering and measuring ads (personalized ads only with your consent)
- Granting in-app purchases and restoring purchases
- Responding to inquiries and requests
- Preventing abuse and handling failures
We will ask for your consent in advance before using data beyond these purposes.
4. Provision to third parties and external transmission
We do not sell the data we collect. Except as required by law, we do not provide personal information to third parties without your consent. For the purposes above, the App uses the following services, and data is sent to these companies.
- Pangle (Bytedance Pte. Ltd., Singapore): ad delivery. The Pangle SDK is not started until you answer the ad choice — Pangle End User Data Privacy Policy
- Google Firebase (Cloud Firestore, Firebase Authentication; provided by Google LLC, USA): storing leaderboard and account linking data — Firebase Privacy and Security
- Sign in with Apple (Apple Inc., USA; iOS only) / Google Sign-In (Google LLC, USA): account linking if you choose it
- App Store (Apple Inc.) / Google Play (Google LLC): payments for in-app purchases
By the nature of the leaderboards, your nickname and leaderboard results are shown to other players.
5. Transfers to third parties in foreign countries
As described in section 4, personal information (including personally related information) may be provided to or processed by companies outside Japan. Under Japan's Act on the Protection of Personal Information, we provide the following information.
- Countries: Singapore (Bytedance Pte. Ltd., which operates Pangle) and the United States (Google LLC, Apple Inc.). Leaderboard data is stored on Google Cloud servers through Firebase and may be processed on servers outside Japan. Where Pangle stores and processes data is set out in Pangle's privacy policy.
- Personal information protection systems in those countries: Singapore has the Personal Data Protection Act 2012 (PDPA). The United States has no comprehensive federal law equivalent to Japan's Act; data is protected by state laws such as the California Consumer Privacy Act (CCPA) and sector-specific laws. See the Personal Information Protection Commission of Japan's survey of foreign systems for details.
- Measures taken by the recipients: Google applies security measures such as encryption and access control under the Firebase data processing and security terms. Pangle, Apple and Google handle data under their own privacy policies. We use these services after reviewing their terms and privacy policies.
Leaderboard data is sent only if you agree to join the leaderboards.
6. Security measures
- Technical: All communication is encrypted with HTTPS (TLS). Cloud Firestore security rules limit reads to authenticated users, limit writes to data under your own anonymous ID, and validate the nickname length (1-16 characters) and score ranges. Deleting data from the App is not allowed.
- Organizational: We limit who handles personal information and who can access the Firebase console, and prohibit viewing or using it for other purposes.
- Data minimization: Only the minimum data needed for the leaderboards is sent; we do not collect payment information, names or addresses. The ad SDK is not started until you answer the ad choice.
- Understanding the external environment: For data processed on servers outside Japan, we handle it with an understanding of the recipient countries' systems as described in section 5.
7. Your rights (access, correction, deletion, suspension, etc.)
You may request notification of the purposes of use, disclosure (including records of provision to third parties), correction, addition or deletion, suspension of use or erasure, and suspension of provision to third parties of your personal information held by us.
7-1. What you can do in the App
- Leave the leaderboards: On the screen opened from the person icon on the leaderboard screen ("Account linking" on Android), you can stop participating. After that, nothing is sent or fetched.
- Unlink an account: On the same screen, tap "Unlink" to remove the link to Apple / Google.
- Ad settings: Change your personalized-ads choice at any time from "Ad settings" on the title screen. On iOS you can stop tracking in Settings > Privacy & Security > Tracking; on Android you can reset or delete your advertising ID under "Ads" in the device settings.
- Delete on-device data: Deleting the App erases the game data on the device.
7-2. Requests by email
To correct your nickname, delete your leaderboard records or account, or request disclosure or suspension, email support@fujibit.com. Because leaderboard data is managed by an anonymous ID, we will ask for your nickname and, if linked, the linked account's email address to identify your records and verify your identity. Once verified, we respond without delay (deletion requests within 30 days). See Account & Data Deletion Request for the steps.
For data collected by Pangle, please contact the address given in Pangle's privacy policy.
8. Minors
The App is not directed at children under 13. Minors should get a parent's or guardian's consent before joining the leaderboards, linking an account or making in-app purchases. Please do not put real names, school names or other identifying information in nicknames. Parents who want their child's data deleted can contact us as described in section 7.
9. Changes to this page
We may update this page when laws change or the App's features change (such as changes to the data handled or the recipients). We will announce important changes on this page.
10. Contact
For questions or requests about personal information, contact:
Fuji Bit Inc.
support@fujibit.com
Last updated: October 24, 2026