Privacy Policy
Last updated: November 12, 2026
This policy explains how Block Relay (“the App”), a puzzle game made by Ken Studio (“we”), handles information. You do not need to sign up or give us your name or email address to play. We do not sell your personal information.
1. Information stored only on your device
- Game progress — levels and screens completed, best scores, missions, hints and post credits.
- Settings — sound, music, vibration, language and whether notifications are on.
- The list of authors you have blocked, and Daily Challenge scores waiting to be sent while you are offline.
This data stays in the App's storage on your phone and is removed when you clear the App's data or uninstall it.
2. Anonymous account
When the App starts it signs in to Firebase Authentication (Google) anonymously: Firebase creates a random user ID for this installation. We do not collect your name, email address or phone number. Firebase may process your IP address and device information to provide the sign-in. If you uninstall the App, a new anonymous account is created next time and the old one cannot be recovered.
Planned: a future update will let you link a Google account to keep your progress on a new phone. Only if you choose to link, Firebase Authentication will receive your Google account ID, email address, name and profile photo link for that purpose. We will update this policy before the feature is released.
3. Community and leaderboards (Google Cloud Firestore)
Online features store the following data in Firestore, linked to your random user ID:
| Data | What it contains | Who can see it |
|---|---|---|
| Nickname | Generated automatically from Latin letters and digits (for example SunnyPanda482); you do not type it. Stored in your user record together with the times of your last three posts, used for the posting limit (3 screens per 7 days). | Shown next to your posted screens and leaderboard scores. |
| Screens you post | The grid layout, goal, move limit, seed and the winning move list, plus your nickname, user ID, posting time and play, like and report counts. | Public to all players of the App, with your nickname. |
| Likes | Which screens you liked and when. | Only a total count is shown. |
| Reports | The screen, the reason you chose (offensive, impossible, spam, other), your user ID as reporter, the author's user ID and the time. | Not shown to players; used for moderation. |
| Leaderboard scores | Your best daily and weekly Daily Challenge score, number of moves, board seed and nickname. | Other players on the day and week leaderboards. |
The random user ID is stored with your screens and scores (for example so other players can block an author) but is not displayed in the App. A screen reported by several players is hidden automatically, and we may review and remove content that breaks the Terms of Use. Blocking an author only hides their screens on your device.
4. Notifications (Firebase Cloud Messaging)
If you turn on New-screen notifications, the App asks for notification permission and subscribes your device's FCM token to one topic shared by all players. We send at most one digest notification per day (for example “N new screens today”). The token is not linked to your nickname, and notifications are not personalised. You can turn them off at any time in Settings → New-screen notifications or in your phone's settings.
5. Ads (Google AdMob)
The App shows rewarded video ads only, and only when you tap Watch ad to earn a hint. There are no banner or pop-up ads. When an ad is requested, Google AdMob collects the advertising ID, device and app information, and your IP address, from which it derives an approximate location. See How Google uses information from sites or apps that use its services.
In the EEA, the UK and Switzerland, Google's consent message (User Messaging Platform) asks for your choice before personalised ads are shown. You can reset or delete your advertising ID, or opt out of ad personalisation, in your Android settings.
6. App configuration (Firebase Remote Config)
Remote Config lets us adjust settings such as ad and community limits without an app update. It uses a Firebase installation ID, the app version and your device's language and country. The installation ID is also used by Cloud Messaging.
7. What we do not collect
No name, email, phone number, contacts, precise location, photos or microphone. The App currently contains no analytics or crash-reporting SDK and has no in-app purchases.
8. Service providers and legal bases
Google acts as our service provider for Firebase (see Privacy and Security in Firebase) and as an independent controller for AdMob. Data may be processed on Google servers outside your country, with the safeguards Google provides (such as Standard Contractual Clauses). Under the GDPR we rely on: performance of our agreement with you (game, community and leaderboard features), your consent (notifications, personalised ads where required), and our legitimate interests (security, preventing abuse, moderating reported content, non-personalised ads that fund the free game).
We do not sell personal information or share it for cross-context behavioural advertising beyond the ads described above. We may disclose information if required by law.
9. Retention and security
Device data stays until you clear the App's data or uninstall it. Your user record, posted screens, likes and leaderboard scores are kept until you ask us to delete them, or until we remove old community screens or leaderboard periods. Reports are kept for moderation; when your data is deleted, reports you filed are kept without your user ID. All connections use encryption (HTTPS), and Firestore security rules only let your own account change your records.
10. Children
The App is intended for players aged 13 and over and is not directed at children under 13. We do not knowingly collect personal information from children under 13. If you believe a child has used the community features, contact us and we will delete the data.
11. Your rights
Depending on where you live (for example under the GDPR / UK GDPR, the CCPA, Vietnam's Decree 13/2023/ND-CP, Japan's APPI or Korea's PIPA), you may have the right to access, correct or delete your information, to object to or restrict processing, to withdraw consent and to complain to a data protection authority. Email blockrelay@kenstudio.app with the nickname shown in Settings → Nickname; we answer within 30 days. To delete your data see Delete your data.
12. This website
This site is hosted on Cloudflare, which processes your IP address to deliver pages and protect against abuse. It stores one cookie, lang, to remember your language. It has no analytics or ads.
13. Changes
We may update this policy, for example when Google account linking is released. The date at the top shows the current version.
14. Contact
Ken Studio · Vietnam · blockrelay@kenstudio.app