Privacy Policy

1. What we collect

We never collect information that directly identifies you, such as your name, email, phone number, contacts, photos or precise location. There is no sign-up or log-in.

The following tools collect information. All of them are provided by Google.

• Google AdMob (ads) - to choose, show and measure ads: the advertising ID, an approximate location derived from the IP address, device model and OS version, and which ads were viewed or tapped
• Firebase Crashlytics (crash diagnostics) - when the app crashes: device model, OS version, app version, the call stack where the error happened, and state such as device language and free storage
• Google Analytics for Firebase (usage statistics) - app opens and closes, which board sizes and difficulties are played, device model and OS version, the advertising ID, and an approximate country derived from the IP address
• Firebase Remote Config (settings) - a per-installation identifier used when downloading settings such as ad frequency and hint refill time

Why. The game is free and supported by ads. Crash diagnostics are the only way for us to learn why the app fails on devices we do not own, and usage statistics show which board sizes and difficulties are actually played, so we can tune the boards.

⚠️ This information does not tell us who you are, and we do not try to find out. Your game data itself (the board in progress, records, Daily Challenge calendar) is never sent.

2. What stays on your device

The following is stored only on your device and is deleted when you uninstall the app.

• The board in progress and resume information
• Best times per board size and difficulty, games completed, and unlocked difficulties
• The Daily Challenge calendar and completion marks
• Hints remaining and when they refill
• Settings such as sound, vibration, line highlight, animations, mistake limit and daily reminders

We do not collect this information and have no way to see it.

3. Network use

The game itself works offline. Boards are generated on your device and none are downloaded from a server. Without an internet connection you can still solve boards and keep your records.

The network is used only to load ads, to send the diagnostics and statistics in section 1, and to download settings. All traffic is encrypted with HTTPS. When you are offline, no ads are shown, nothing is sent, and the game works as usual.

4. Advertising and payments

• Banner ads - at the bottom of the game screen
• Interstitial ads - after finishing a board, at intervals
• Rewarded ads - only if you choose to watch one when you are out of hints, to receive one hint

The advertising ID is used to choose and measure ads. Users in the European Economic Area, the UK and Switzerland see Google's consent form on first launch and can choose whether to receive personalised ads. If you decline, you can still play, and non-personalised ads are shown.

Anywhere in the world, you can reset or delete your advertising ID in your device settings (Android: Settings → Privacy → Ads).

If in-app purchases such as ad removal are added later, this page will be updated before that release and the change recorded in section 10.

5. Permissions

The game asks you for one permission.

• Notifications - to remind you once in the afternoon if you have not played that day's Daily Challenge. It is asked once, after your first win, and you can still play if you decline. Reminders are scheduled on your device and do not go through a server. You can turn them off in the game settings.

The game does not use the camera, microphone, contacts, location or storage. The permissions below are declared automatically by the game and the tools in section 1, and may appear in Android's permission list.

• VIBRATE - short vibrations when you enter a number or make a mistake (can be turned off in settings)
• INTERNET · ACCESS_NETWORK_STATE - loading ads, sending diagnostics and statistics, downloading settings
• com.google.android.gms.permission.AD_ID · ACCESS_ADSERVICES_* - the advertising ID and Android's ad services
• WAKE_LOCK · FOREGROUND_SERVICE - so Google services can finish sending
• Install referrer (BIND_GET_INSTALL_REFERRER_SERVICE) - so usage statistics know which store the app came from

6. Sharing and processors

We do not sell your information. Advertising-related information (the advertising ID, approximate location, which ads were viewed or tapped, and diagnostics) is sent to Google to show and measure ads and to prevent fraud. Crash diagnostics, usage statistics and settings are processed by Google on our behalf and go nowhere else.

The information in section 1 is processed by the following company.

How Google uses information in connection with ads is described in How Google uses information from sites or apps that use its services. The app is distributed through Google Play. Information the store collects during download follows the store's own policy, and we do not receive it.

7. Retention and deletion

Information on your device is deleted when you uninstall the app. No request is needed.

The information in section 1 is kept by Google according to each service's retention period. Because we hold nothing that identifies you, we cannot look up a particular person's records. Resetting your advertising ID disconnects it from earlier records.

8. Children

This game is not directed at children, and we do not knowingly collect personal information from children.

9. Contact

Please send privacy questions to the address below. It is a receive-only address, so replies may take a while.

• Email hello@dalgureum.dev
• Business name Dalgureum Lab (달구름연구소)
• Representative Taeho Kim
• Business registration number 380-26-02092

10. Change history

If anything changes, it will be announced on this page with its effective date.