Privacy Policy

1. Overview

sotjun.com ("this site") provides free browser-based puzzle games including Sudoku and Gomoku. This Privacy Policy explains what information we collect, how we use it, how long we keep it, and what choices you have. By using this site, you agree to the practices described in this policy.

2. Information We Collect

We collect only the minimum information necessary to operate the service.

• Local game data: Settings, completion records, and daily challenge progress are stored in your browser's localStorage on your own device. This data is never sent to our servers.
• Leaderboard submissions: If you choose to submit a score, we store your nickname, completion time, difficulty level, and puzzle ID. No other personally identifiable information is collected.
• Server logs: Our hosting and CDN providers may automatically generate basic access logs (request time, IP address) for security and debugging purposes.

3. Advertising and Cookies (Google AdSense)

This site uses Google AdSense, an advertising service provided by Google LLC, to display advertisements. Google AdSense uses cookies and similar tracking technologies to serve ads that are relevant to your interests.

Through this process, Google may place cookies — including the DoubleClick cookie — in your browser. Google may use information from your visit to this site, combined with data from other sites you have visited, to personalize the ads you see.

For more information about how Google uses data from sites that use its services, please visit:

• Google Privacy Policy: policies.google.com/privacy
• Google Ads Settings: adssettings.google.com

You can opt out of personalized advertising by visiting the Google Ads Settings page linked above. You may also manage or disable cookies through your browser settings. Please note that disabling cookies may affect the functionality of some site features.

4. How We Use Information

• To provide core gameplay features (timer, daily challenge, leaderboards)
• To maintain service security and troubleshoot technical issues
• To operate the site through advertising revenue

5. Data Retention

• Local storage data: Remains on your device until you clear your browser data.
• Leaderboard data: Retained as long as necessary to operate the ranking feature.
• Server logs: Retained for a limited period in accordance with our hosting provider's policies.

6. Your Choices

• You can delete localStorage and cookies through your browser settings at any time.
• You can choose not to submit scores — leaderboard participation is entirely optional.
• You can opt out of personalized ads via the Google Ads Settings page.
• For any privacy-related requests, please use the Contact page.

7. Third-Party Disclosure

We do not sell or share your personal information with third parties except as part of the Google AdSense advertising service described above. For details on how Google processes data, please refer to Google's Privacy Policy.

8. Changes to This Policy

We may update this policy from time to time to reflect changes in law or service updates. When we do, the "Last updated" date at the top of this page will be revised. Continued use of the site after any changes constitutes acceptance of the updated policy.

9. Contact

If you have questions about this policy, please reach out via the Contact page.