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Privacy Policy

Last Updated: September 29, 2025

Important Notice: Just-Sudoku is a completely local game that runs entirely on your device. We do not collect, store, or transmit any of your personal information to our servers.

1. Information Collection

Just-Sudoku adopts a "privacy-first" design philosophy:

Local Storage: All game data (progress, settings, statistics) is stored only locally on your device
No Server Transmission: We do not send any of your information to our servers
No Account Required: No registration or personal information is required to use this service

2. Locally Stored Data

To provide the best gaming experience, we store the following information locally on your device:

Game Settings: Language preferences, difficulty selection
Game Statistics: Completion times, best score records
Game Progress: Current game state (only while playing)

This data is stored only in your browser's local storage and can be cleared at any time.

3. Technical Information

We may collect the following technical information to improve our service:

Browser Information: Browser type and version (for compatibility optimization)
Device Information: Screen resolution and device type (for interface adaptation)
Usage Statistics: Page visits and feature usage (anonymized)

4. Cookies and Local Storage

We use the following technologies to improve your experience:

LocalStorage: Stores game settings and progress
SessionStorage: Temporarily stores current game state
Technical Cookies: Used only for basic functionality, contains no personal information

You can control or delete this data through your browser settings.

5. Third-Party Services

Just-Sudoku is a completely independent service that does not integrate any third-party analytics, advertising, or tracking services. We do not share any of your information with third parties.

6. Data Security

Since all data is stored locally on your device:

Your data is not transmitted over the internet
We cannot access any information on your device
Data security is entirely protected by your device and browser

7. Children's Privacy

Our service is suitable for users of all ages. Since we do not collect personal information, it is particularly suitable for children and does not require parental consent.

8. Data Deletion

You can delete all locally stored data at any time:

Clear Data Button: Use the "Clear Data" button in the footer to instantly remove all stored game settings, statistics, and language preferences
Clear website data through browser settings
Delete browser cache and local storage
Reinstall browser (will clear all data)

The "Clear Data" function will remove:

Game difficulty preferences
Language settings
Game statistics and best times
All other locally stored data

9. Privacy Policy Updates

We may update this Privacy Policy from time to time. Any changes will be posted on this page and the "Last Updated" date will be updated. We recommend that you review this policy regularly.

10. Contact Us

If you have any questions or suggestions about this Privacy Policy, please contact us through our website.

Summary: Just-Sudoku is committed to protecting your privacy. We do not collect, store, or transmit your personal information. All data remains on your device and is completely under your control.

This Privacy Policy was last updated on September 29, 2025