Sudoku · Privacy Policy
1. Scope
This Policy applies to your use of the Sudoku mobile app (the “App”) and related backend APIs. Together with the Terms of Service, it forms your agreement for using Sudoku.
2. Operator
Sudoku is developed and operated by Hope Tech.
- Email: hope.tec.xyz@gmail.com
- We aim to respond to privacy requests within 15 business days.
3. Information We Collect and Why
We follow principles of lawfulness, fairness, necessity, and data minimization.
3.1 Device identifier (core)
| Data | Required? | Purpose | Notes |
|---|---|---|---|
| deviceNo (anonymous device ID) | Yes | Associate completion records, unlock status, weekly best scores | Generated and stored locally on device; not a direct identity such as name or phone number. |
3.2 Game-related data
| Data | Required? | Purpose | Notes |
|---|---|---|---|
| Selected difficulty, puzzle ID | When playing | Deliver puzzles and validate completion | Needed for fair play and consistency. |
| Completion duration and timestamp | When submitting a win | Show history and weekly best | Submitted after you finish a game. |
| Final board state (for validation) | When submitting a win | Server-side full-board validation | Used to confirm a correct completion. |
3.3 Information we do not collect
- Name, phone number, email, government ID
- Precise location, contacts, SMS, call logs
- Advertising IDs (AAID/OAID), IMEI, MAC, serial numbers for ad tracking
- Installed-app lists, microphone or camera content
- Any data for advertising or cross-app tracking
4. Device Permissions
| Permission | Purpose | Required? |
|---|---|---|
| Internet (INTERNET) | Communicate with the backend for puzzles and records | Yes |
The App does not currently request microphone, camera, contacts, or precise location permissions.
5. Third Parties and Sharing
5.1 Game records and puzzle data are stored in databases operated by us. Legal pages are served as static files from the same backend.
5.2 We do not share user information with advertisers, data brokers, or marketing partners.
5.3 Except where required by law or necessary to protect users and system security, we do not voluntarily disclose your information to third parties.
6. Storage and Security
- Location: Business data is stored on servers we operate in mainland China.
- Transit: Production traffic uses HTTPS; local development may use LAN HTTP for testing only.
- Access control: APIs read/write records associated with deviceNo and do not expose arbitrary public browsing of user data.
No method of transmission or storage is perfectly secure. Please keep your device secure and prevent unauthorized use of the App.
7. Retention
- Game records: Retained as needed to show history and unlock status. If you email a deletion request and we can verify identity (for example, by deviceNo), we will delete or anonymize related records within a reasonable time.
- Service logs: Access/error logs retained no more than 180 days for troubleshooting.
- Legal retention: Minimum information required by law may be kept for the statutory period.
8. Your Rights
- Access: View completion records linked to this device in the in-app Records screen.
- Correction: Contact us under Section 13 if you believe a record is incorrect.
- Deletion: Email us to request deletion of records linked to deviceNo. Clearing local app data or uninstalling invalidates the local identifier but does not automatically erase server-side history.
- Complaints: Contact us under Section 13 if you believe our processing violates this Policy or applicable law.
9. Minors
The App is a general puzzle product and is not designed to specially collect children’s personal information. Minors should use the App with guardian consent and guidance. Guardians may contact us under Section 13 to request handling of related data.
10. Cross-Border Transfer
Our servers and storage are in mainland China. If you use the App outside mainland China, your information will be transferred to mainland China for processing. We do not transfer the information described in this Policy overseas for unrelated purposes.
11. Ads and Personalized Marketing
- We do not show third-party ads or integrate ad SDKs;
- We do not perform behavior-based marketing push;
- We do not sell user data.
12. Changes
When we update this Policy, we will publish the new version in the App. For material changes (such as new data categories or broader sharing), we will provide reasonable notice. Please review the latest version periodically.
13. Contact Us
- Email: hope.tec.xyz@gmail.com
- We aim to respond within 15 business days.
If you are unsatisfied with our response, you may also complain to the competent privacy or consumer-protection authority in your region.