Last updated 2 September 2026. These terms cover your use of donka-puzzles.com. Using the site means you accept them.
The Sudoku game and the guides are free to use, for personal and non-commercial purposes, no account required. You're welcome to play as much as you like, link to any page, and share puzzle results.
The site's design, code, written guides and diagrams are the property of Donka Puzzle Co. You may not reproduce or republish them without permission. Quoting a short passage with a link back is fine and welcome.
Individual Sudoku grids are generated algorithmically and no ownership is claimed over any particular puzzle. Sudoku as a puzzle format is not owned by anyone.
The site is provided as it is, without warranty of any kind. It may be unavailable at times, for maintenance or for reasons outside our control. Features may change or be removed.
Your streak and puzzle progress are stored only in your own browser. They can be lost by clearing your browser data, using a different device or browser, or browsing privately. We hold no copy and cannot restore them.
The strategy guides are written carefully and the techniques described are standard and correct, but they're offered as instruction rather than as a guarantee. If you spot an error, please tell us — we'd rather fix it than defend it.
This site carries advertising served by Google AdSense. We do not control which specific ads appear and are not responsible for the content, products, or practices of advertisers. See the privacy policy for how advertising cookies are handled.
Some pages link to other websites. Those sites are not under our control and we are not responsible for their content or their privacy practices.
To the fullest extent permitted by law, Donka Puzzle Co. is not liable for any indirect or consequential loss arising from your use of this site, including lost puzzle progress or streak data. Nothing in these terms limits liability where it cannot lawfully be limited.
These terms may be updated. The current version always appears on this page with its date. Continuing to use the site after a change means you accept the revised terms.
Questions about these terms: [email protected].