The following terms carry specific meanings wherever they appear in this document:
Sudokum.net provides online puzzles at three difficulty levels — easy, medium, and hard — along with a Daily Sudoku that refreshes every day and a real-time leaderboard. The Game Coach runs in three modes: silent, balanced, and teaching. The platform also offers printable puzzles for adults and children, a simplified section designed specifically for younger players, the SudoHub community space, and an interface available in twenty languages.
By accessing the site, you automatically agree to these terms. No separate action is required.
The platform is open to all ages. For children under thirteen, parental supervision is recommended.
You are free to play puzzles, take part in the daily challenge, view the leaderboard, and print puzzles for personal use — all without needing prior permission.
The following require authorisation or are expressly prohibited: reselling, reproducing, or creating derivative works from the content for commercial purposes; copying the software or attempting to access the source code through reverse engineering; bulk-downloading puzzles using automated systems.
The following actions are strictly prohibited:
- Manipulating scores using bots, scripts, or any automated software
- Generating false results to distort the ranking system
- Disrupting or degrading the experience of other players
- Attempting unauthorised access or circumventing the system's security protections
- Sending malware or any malicious code
- Launching distributed denial-of-service attacks against the servers
- Using Sudokum's brand, logos, or content without authorisation
- Taking any action that violates applicable law or infringes the rights of third parties
The puzzle database, Game Coach algorithms, designs, logos, and software code belong to Sudokum.net and are protected by international copyright law.
Sudoku itself is a universal logic puzzle in the public domain. However, the puzzle-generation system, scoring algorithms, and interface on this platform are original works created by us.
You don't need to register to play. If you want to appear on the leaderboard or take part in competitive mode, simply enter a username.
Usernames must not contain insults, hate speech, or obscene language, and may not impersonate another player. Inappropriate usernames will be removed without warning.
Everyone on the leaderboard plays by the same rules. Results must come from your own ability alone; using auto-solvers, browser extensions, or any assistive software is not permitted. Manipulating rankings across multiple usernames falls under the same category of violation.
Deliberately exploiting system vulnerabilities is also treated as a breach of these terms.
Ranking periods and scoring methods may change, with advance notice provided.
Playing requires no account or email address. IP addresses, browser information, and access times are stored for server security; game statistics are processed for ranking purposes; language and theme preferences are saved in your browser. Usernames are optional.
Only technically necessary cookies are used. Your data is never sold to third parties.
The service is provided "as is." We do not guarantee uninterrupted or error-free operation; server failures may result in loss of game data. We accept no liability for direct or indirect damages arising from use of the site.
These terms may be updated at any time. Significant changes will be reflected in the date at the top of the page; major updates will also be announced on the homepage. Continuing to use the site after an update constitutes acceptance of the revised terms.
These terms are interpreted in accordance with the international legal framework governing the internet. In the event of a dispute, direct resolution between the parties takes priority.