Privacy Policy

Effective date: September 2, 2026

This policy applies to the mobile game Prism Defense (the "Service"), provided by Dongmin Yu (the "Developer"). This policy also describes how the Developer processes information when you visit the official Prism Defense website at prism-defense.donminzzi.kr (the "Website").

1. Overview

The Service requires no account, and the Developer operates no server of their own. The Developer does not sell your personal information.

The Service does use Google's Firebase, and through it the information listed in section 3 is collected and processed on Google's infrastructure. Google processes that information on the Developer's behalf.

2. Information stored on your device

The following game records and settings are stored on your device. As described in section 3, selected gameplay summaries and settings state are also sent to Firebase for statistical purposes.

• Game records (best wave, kills, daily challenge records, achievements, Prism balance)
• Settings (sound/music mute, language, tower strategy modes, equipped palette, and similar)

Uninstalling the app deletes these game records and settings from your device.

3. Information collected through Firebase

Google Analytics for Firebase — collected for statistical purposes, to improve the Service:

• App instance ID (a device identifier assigned automatically per installation)
• Advertising identifier (Android Advertising ID, iOS IDFA — on iOS, only where you have permitted tracking)
• Coarse location derived from your IP address
• Usage records, including screen views, run starts, end-of-run summaries (mode, wave reached, kills, per-tower strategy modes, and revive use), tutorial outcomes (completion, skip, or storage failure), ad placement and lifecycle status (offer, display request, impression, reward, dismissal, failure, suppression, or unavailability), related reasons, and whether a reward was accepted
• Settings state (equipped palette, whether the extended speed option is unlocked)
• Device and app information (model, OS version, app version)

This information is not collected to identify you personally, and the Developer does not attach a user account identifier to analytics data.

Firebase Crashlytics — collected to diagnose crashes and errors:

• Stack traces and application state at the time of the error
• Device and operating system information
• A record of the screens visited immediately before the error
• Crashlytics installation identifier

Firebase Authentication (Play Games sign-in) — processed only if you use Play Games sign-in:

• The user identifier issued by Firebase
• The IP address of the sign-in request (to prevent abuse)

Sign-in is optional; every feature of the game is available without it.

For details on Google's processing, see the Google Privacy Policy.

4. Advertising (Google AdMob)

Rewarded ads and interstitials are served through Google AdMob, and Google may collect and process:

• Advertising identifiers (Android Advertising ID, iOS IDFA)
• IP address and coarse location
• Device information (model, OS version, and similar)
• Ad-interaction data (impressions, clicks)

For details, see Google ad technology providers.

5. Ad consent

• In regulated regions (EEA, UK, and similar), the Google UMP (User Messaging Platform) consent form appears, and you can choose whether to receive personalized ads.
• On iOS, the App Tracking Transparency (ATT) prompt may be requested. If you decline, ads are served without the app having access to the advertising identifier (IDFA), so they are less relevant to your interests. The app does not itself select a non-personalized ad mode; what is actually served is decided by Google from your consent state and your ATT response.
• Gameplay is never restricted by your consent choice. Consent gates ads, not play.
• When Google UMP requires it, you can change or withdraw consent through Ad privacy options in the app settings.
• You can reset or delete the advertising identifier in device settings.
• You can also change iOS tracking permission in device settings.

6. Website analytics (Vercel Web Analytics)

The Website uses Vercel Web Analytics to measure aggregate traffic and improve the Website. Vercel processes the following information on the Developer's behalf:

• Event timestamp
• Page URL and route
• Referrer
• Filtered query parameters
• Country, region, and city derived from the request
• Browser, operating system, and device type
• Web Analytics script version

Vercel Web Analytics does not use third-party cookies. Vercel identifies a visitor through a hash created from the incoming request. The hash is valid for one day and is then reset. Vercel provides the Developer with aggregated statistics that are not tied to an individual or an IP address.

For details, see Vercel Web Analytics Privacy and Compliance.

7. Retention

Game records and settings stored on your device are deleted when you uninstall the app. Retention of information collected through Firebase follows Google's policies and the retention period configured by the Developer. Retention of information collected through Vercel Web Analytics follows Vercel's policies.

8. Children

The Service is not directed at children, and the Developer does not knowingly collect personal information from children.

9. Your rights

• Uninstalling the app deletes all information stored on your device.
• You can reset or delete your advertising identifier at any time in your device settings.
• To request access to or deletion of information collected through Firebase, contact the Developer below.
• To ask about information processed through Vercel Web Analytics, contact the Developer below.

10. Changes to this policy

If this policy changes, the revised policy and its effective date will be posted on this page.

11. Contact

• Developer: Dongmin Yu
• Email: ydm2790@gmail.com