Hamdoku Privacy Policy
Hamdoku: Sudoku Puzzle · Last updated: October 31, 2026
This Privacy Policy explains what information the Hamdoku: Sudoku Puzzle app ("Hamdoku", "the app") collects and how it is used. The app is published by Om Software ("we", "us", "our"). By using the app you agree to this policy.
1. Summary
- There are no accounts. We do not ask for your name, email address, phone number or any other personal details.
- Your game progress is stored on your device only.
- The app is free and shows ads. Ads, analytics and push notifications are provided by third-party services, which collect some device information as described below.
- We do not sell your personal information.
2. Information stored on your device
The app saves your progress locally using the device's standard storage: levels completed, coins, daily challenge history, settings (such as sound and color assist), whether you have accepted these policies, and similar preferences. This information stays on your device. We do not receive a copy of it, and it is deleted when you uninstall the app or clear its data.
3. Information collected by third-party services
To run the app, show ads and understand how it is used, the app includes services from third parties. These services may collect the information below automatically when you use the app. This information is not linked by us to your name or identity.
| Service | Purpose | Information involved |
|---|---|---|
| Google AdMob / Google Mobile Ads | Showing ads, ad measurement, fraud prevention | Advertising ID (Google Advertising ID on Android, IDFA on iOS, if permitted), IP address and approximate location derived from it, device and OS information, ad interactions, diagnostics and crash information |
| Firebase Analytics | Understanding how the app is used | App interactions and events, Firebase installation ID, device and app version information |
| Firebase Remote Config | Delivering app settings and links (for example ad settings, support address, and the links to this policy) without needing an app update | Firebase installation ID, IP address, device and app version information |
| Veldora | Push notifications | A random installation ID, push notification token, notification permission status, app version, operating system version, device model, language setting |
| Google Play (Android only) | Measuring which source led to an install (Install Referrer) | Install source information provided by Google Play |
| Google Play / App Store | Rating prompt, store features and updates | Handled by Google or Apple under their own policies |
These providers process data under their own privacy policies: Google Privacy Policy, How Google uses data from apps that use its services, Firebase privacy information, Veldora.
4. How we use information
- To provide and run the game, and to keep it working properly.
- To show ads, which keeps the app free.
- To measure usage and fix bugs and performance problems.
- To send push notifications, if you allow them.
- To tell you when a new version of the app is available.
- To reply to you if you contact us.
5. Advertising and your choices
Ads in the app may be personalized or non-personalized, depending on your choices and where you live.
- iOS: the app asks for your permission before tracking you across other companies' apps and websites (App Tracking Transparency). You can change this at any time in Settings > Privacy & Security > Tracking, and reset or limit ad tracking there.
- Android: you can reset your advertising ID, or opt out of ads personalization, in Settings > Privacy > Ads (the exact path depends on your device).
- EEA, UK and other regions: where required by law, the app shows a consent form for ads before personalized ads are shown. You can change your choice where the app offers it, or through your device settings.
- Notifications: you can turn push notifications off at any time in your device's system settings.
6. Sharing of information
We do not sell your personal information. Information is shared only with the service providers listed above, who process it for the purposes described, and where required by law or to protect our rights. If we ever sell or transfer the app to another party, information held by us may be transferred as part of that.
7. Contact by email
If you send feedback from the app, it opens your own email app. We only receive what you choose to send, including your email address, and we use it solely to respond to you.
8. Data retention and deletion
Progress data lives on your device and can be deleted by uninstalling the app or clearing its data. Data held by third-party providers is kept according to their own retention policies. Because there are no accounts and we cannot identify you from the app's data, we generally cannot look up or delete data about a specific person, but you can reset your advertising ID in your device settings, which disconnects past advertising data from you. If you have a question or request about your data, email us at the address below.
9. Children's privacy
Hamdoku is a general-audience puzzle game and is not directed at children under 13 (or the equivalent minimum age in your country). We do not knowingly collect personal information from children. If you believe a child has provided us personal information, contact us and we will help get it removed.
10. Your rights
Depending on where you live (for example in the European Economic Area, the United Kingdom, California and other US states), you may have rights to access, correct, delete or restrict the use of your personal data, to object to processing, and to withdraw consent. You also have the right to complain to your local data protection authority. To exercise these rights, contact us at the address below. We do not "sell" or "share" personal information as those terms are defined under California law, other than the advertising-related disclosures made by ad partners described above, and you can opt out of those through the controls in section 5.
11. Security
Data sent between the app and the services above uses encrypted connections (HTTPS). No method of electronic storage or transmission is completely secure, so we cannot guarantee absolute security.
12. International transfers
Our service providers may process data in countries other than your own, including the United States. Where required, they rely on legal mechanisms for international transfers.
13. Changes to this policy
We may update this policy from time to time. The "Last updated" date at the top shows when it last changed. Continued use of the app after a change means you accept the updated policy.
14. Contact us
Om Software
Email: omsoftware66@gmail.com