Privacy Policy

Last updated: 1 October 2026

Sudoku Planet is a sudoku puzzle game for players of all ages. We take the privacy of our users and their families very seriously. This policy explains what information we collect, how we use it, and how we protect it when you use our app.

1. Information we collect

• Game progress: completed levels, stars earned, and practice / daily puzzle records. This is stored only on your own device, so you can continue where you left off.
• Preferences: difficulty, volume, hints per level, etc. — also stored only on your device.
• We do not require an account, so we do not collect any account information.

2. Information we do NOT collect

• We do not collect personal identity information such as name, phone number, email address, or location.
• We do not collect personal information from children.
• The app does not upload any data over the network: there is no server side, and it does not send your game data or device information to any remote server.

3. Children's privacy

The app is suitable for all ages, including children, and all core features work offline with no account. We do not knowingly collect personal information from children under 13. The app contains no third-party advertisements, no in-app purchases (IAP), and no links to external third-party content.

4. Sharing with third parties

We do not sell, rent, or share any information with any third party. The version distributed on Google Play collects no data at all and contains no analytics or tracking of any kind.

5. Analytics on this website

This website (daqin001.cn), where this policy is hosted, is run by us and does measure its own traffic — but using our own server, with no third-party analytics service.

• How: server access logs, plus a small (~1.5 KB) script we wrote ourselves. It only sends one request to our own server and loads no external scripts.
• What is recorded: the page viewed, which button was clicked, the referring site, screen size, page language, and a random session id.
• No cookies, no cross-site tracking, never sold or shared. The session id lives only in the browser’s session storage and disappears when the tab closes.
• The IP address is truncated before it is written to the log (only the network prefix, e.g. 1.2.3.0, is kept); the full IP is never stored.
• You can opt out entirely via your browser’s Do Not Track or Global Privacy Control setting — we honour both.

6. Data security

Progress and preferences are saved using the device's own storage and are never uploaded to any server. You can clear all locally stored data at any time by uninstalling the app.

7. Your rights

Because your data is stored only on your device, the app runs no server-side service and we hold no personal data about you, no separate data-deletion request is needed — uninstalling the app removes all local data completely.

8. Contact us

If you have any questions about this policy, please reach us via the contact information provided on the app store page or by the developer, or by email at devkits.app@gmail.com.

9. Changes to this policy

If this policy changes, we will update it within the app and (where applicable) ask for your renewed consent.