Last updated: September 14, 2026
These Terms of Use govern your access to and use of Sudoku Online, including Sudoku games, accounts, statistics, daily challenges, tournaments, leaderboards, guides, and other website features. By using the site, you agree to follow these terms and applicable law.
1. Using the website
You may use the website for lawful personal entertainment, learning, and Sudoku practice. Core gameplay is intended to be accessible without payment unless a feature is clearly described otherwise.
2. Accounts
An account is optional for most gameplay. If you create one, you are responsible for providing accurate account information, protecting your credentials, and activities carried out through your account. Do not share passwords or attempt to access another person’s account.
3. Fair play, scores, and competitions
Daily challenges, tournaments, leaderboards, and score-based features depend on fair submissions. You must not manipulate requests, automate prohibited gameplay, submit fabricated results, interfere with timing or validation systems, exploit software defects to gain an unfair ranking, or impersonate another player.
We may reject, remove, correct, or exclude results that are duplicated, corrupted, technically invalid, abusive, or reasonably suspected of violating fair-play rules. Unless a competition page explicitly states otherwise, rankings and achievements on the site do not represent a promise of cash, prizes, or financial value.
4. Acceptable use
You must not use the website to distribute malware, probe for vulnerabilities without authorization, overload the service, scrape or automate requests in a way that harms availability, bypass access controls, interfere with other users, or use the site for unlawful activity.
5. Website content
The website contains game interfaces, text, graphics, guides, software, branding, and other materials. Except where applicable law or a separate license allows otherwise, you may not reproduce, republish, sell, or redistribute substantial parts of the site as your own service without permission.
You may link to public pages and refer to Sudoku techniques described in our guides. Sudoku rules and general solving concepts are not claimed as exclusive ideas; these terms apply to the website’s own presentation, software, content, and brand assets.
6. Availability and changes
We may improve, change, suspend, or discontinue features when needed for maintenance, security, product development, legal compliance, or technical reasons. Saved games, rankings, streaks, statistics, and other online features can be affected by outages, browser storage changes, account changes, or software updates.
7. No guarantee of uninterrupted or error-free service
We work to keep the site reliable and Sudoku logic consistent, but the service is provided on an “as available” basis. We do not promise that every feature will always be available, that every device/browser combination will behave identically, or that the website will never contain an error.
8. Educational information
Sudoku guides, hints, and strategy articles are provided for general learning and entertainment. They are not professional, medical, legal, financial, or other regulated advice.
9. Privacy
Your use of the site is also subject to the Privacy Policy, which explains account information, gameplay data, guest identifiers, cookies, browser storage, and related controls.
10. Enforcement
We may restrict access, invalidate results, or take other reasonable steps when necessary to protect the website, players, competitions, or security. Where practical, actions are limited to the affected feature or data rather than broader restrictions.
11. Changes to these terms
We may update these Terms of Use when features, policies, or legal requirements change. The “Last updated” date identifies the current published version. Continued use of the site after an update means the current terms apply to future use.
12. Contact
Questions about these terms, copyright, or use of the website can be sent through the Contact page.