Privacy Policy

Application: Zen Sudoku · Last updated: August 10, 2026

This Privacy Policy explains how QuatroIT ("we", "us", "our") collects, uses, and protects information when you use the mobile application Zen Sudoku (the "App"). By using the App you agree to the practices described below. If you do not agree, please do not use the App.

1. Who we are

The App is developed and published by QuatroIT. For any questions about this Policy or about your data, contact us at: zensudoku.quatro@gmail.com.

2. Information we collect

We do not ask you to create an account or to provide your name, email, or other personal contact details to play. The App collects the following categories of data automatically or through third-party services:

• Advertising data. We show ads through Google AdMob. To serve and measure ads, AdMob may process your device's advertising identifier, IP address, general device information (model, operating system, language), and interaction with ads.
• Game progress and account data. We use Unity Gaming Services (UGS) to save your game progress (such as completed puzzles, statistics, in-game crystals, and settings) to the cloud so it can sync across your devices. For this we create an anonymous player identifier. If you choose to sign in with Google Play Games, we also store the identifier provided by that service to link your saved progress.
• Push notification token. We use Firebase Cloud Messaging to send notifications (for example, reminders) and to ensure your account is active on a single device at a time. This uses a device messaging token.
• Analytics data. We use Unity Analytics to understand aggregate usage of the App (such as sessions, levels played, and feature usage) so we can improve it. This data is collected in an aggregated and pseudonymous form.
• Local data on your device. Some settings and progress are stored locally on your device and are not transmitted to us except as part of the cloud save described above.

We do not knowingly collect your real name, phone number, contacts, photos, precise location (GPS), or payment information. The current version of the App contains no in-app purchases.

3. How we use the data

• To operate and display the game and save your progress;
• To sync your progress across devices and keep your session secure;
• To show advertising, which keeps the App free;
• To send notifications you have allowed;
• To analyze usage in aggregate and improve the App;
• To detect, prevent, and address technical issues or abuse.

4. Legal basis and your consent (GDPR)

If you are located in the European Economic Area, the United Kingdom, or Switzerland, we ask for your consent before showing personalized ads, using a consent form provided through Google's User Messaging Platform. You can choose between personalized and non-personalized ads, and you can change your choice later from within the App. Where we rely on consent, you may withdraw it at any time. We also process certain data on the basis of our legitimate interest in operating, securing, and improving the App.

5. Third-party services

The App relies on the following third-party services, which process data under their own privacy policies:

• Google AdMob and Google APIs — https://policies.google.com/privacy
• How Google uses information from sites or apps that use its services — https://policies.google.com/technologies/partner-sites
• Unity Gaming Services and Unity Analytics — https://unity.com/legal/privacy-policy
• Firebase (Google) — https://firebase.google.com/support/privacy

6. Advertising choices

You can opt out of personalized advertising at the device level. On Android, open Settings → Google → Ads and turn on "Opt out of Ads Personalization" or reset your advertising ID. Within the App, EEA/UK/Switzerland users can also adjust their consent choice at any time.

7. Children

The App is intended for a general audience aged 13 and older. It is not directed to children under 13, and we do not knowingly collect personal data from children under 13. If you believe a child has provided us with data, please contact us and we will delete it.

8. Data retention and deletion

We keep your cloud-saved progress for as long as your account remains active. You can request deletion of your account and associated cloud data, after which it will be permanently removed from our systems. To request deletion, use the Delete account option in the App (Settings → Other), contact us at zensudoku.quatro@gmail.com, or see our Account & Data Deletion page for full instructions. Locally stored data is removed when you uninstall the App.

9. Your rights

Depending on your location, you may have the right to access, correct, delete, or restrict the processing of your personal data, to object to processing, and to data portability. To exercise any of these rights, contact us at zensudoku.quatro@gmail.com. You also have the right to lodge a complaint with your local data protection authority.

10. Data security

We use the security measures provided by our service providers (Google and Unity), including encryption in transit, to protect your data. However, no method of transmission or storage is completely secure, and we cannot guarantee absolute security.

11. International data transfers

Our service providers may process and store data on servers located outside your country of residence, including in the United States. Where required, such transfers are protected by appropriate safeguards under the providers' privacy frameworks.

12. Changes to this Policy

We may update this Policy from time to time. When we do, we will revise the "Last updated" date at the top of this page. We encourage you to review this Policy periodically.

13. Contact

QuatroIT
Email: zensudoku.quatro@gmail.com