Privacy Policy

Effective Date: July 1, 2026

This Privacy Policy describes how Number Master (the "App") — developed and operated by YiHui ("we", "us", or "our") — collects, uses, and discloses your information when you use our app.

By using the App, you agree to the collection and use of information in accordance with this policy.

1. Information We Collect

We do not collect any personally identifiable information (such as your name, email address, or phone number).

The App may collect the following types of non-personal information automatically:

• Device Information: Device model, operating system version, and screen resolution — used by third-party advertising services.
• Advertising ID (AD_ID): The Android Advertising ID is used by Google AdMob to serve relevant ads and measure ad performance. You can reset or limit this identifier in your device settings.
• Usage Data: In-app game progress and settings are stored locally on your device and are never transmitted to our servers.

2. How We Use Your Information

We use the collected information solely for the following purposes:

• To operate, maintain, and improve the App.
• To serve advertisements via Google AdMob.
• To analyze ad performance and prevent fraud.

3. Third-Party Services

The App uses the following third-party service:

• Google AdMob — for serving advertisements. AdMob may collect and process device identifiers and usage data as described in their privacy policy. Please review Google's Privacy Policy for more information.

4. Data Storage

All game data (scores, settings, progress) is stored locally on your device using Android's local storage mechanisms (Room database and DataStore). We do not upload, sync, or store your data on any remote server.

5. Children's Privacy

The App is suitable for all ages. We do not knowingly collect personal information from children under the age of 13. If you are a parent or guardian and believe your child has provided us with personal information, please contact us and we will take steps to remove that information.

6. Permissions

The App requests the following permissions:

• Internet — required to load advertisements.
• com.google.android.gms.permission.AD_ID — required by AdMob for advertising identifier access.

7. Changes to This Privacy Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated effective date. We encourage you to review this policy periodically.

8. Contact Us

If you have any questions about this Privacy Policy, please contact us at:

Email: yihuihui@gmail.com