Privacy, without the puzzle
This game runs on your device. No account, advertising, tracking script or remote puzzle API is needed.
LAST UPDATED: NOVEMBER 8, 2026
Your game stays in your browser
Puzzles are generated and solved locally, usually in a Web Worker. We do not upload your moves, notes, hint usage or completed grids to a puzzle server or AI service. This site does not request a name, email address, password or payment details.
LocalStorage and streaks
The game uses your browser’s localStorage to save values, pencil notes, elapsed play time, hints, daily completions, streaks and your latest unlimited puzzle settings. This functional storage is not an advertising cookie. It is specific to this browser and device and does not synchronize with another device or with the main Daily Sudoku site.
You can remove it using your browser’s site-data settings for killer.dailysudoku.club. This deletes saved progress and streaks. If storage is unavailable, the game still works in memory but may not retain progress when you leave.
Hosting information
Cloudflare hosts and delivers the site. It may process ordinary request information, including IP address, requested URL and browser details, to serve and secure pages. The site bundle includes no analytics or tracking scripts, advertising networks, external fonts or third-party puzzle APIs.
Sharing is optional
Copy result writes a text summary to your clipboard only when you press it. If access is denied, the summary appears in a selectable text box. The site never automatically sends or posts your result.
Links to other pages
The footer links to the main Daily Sudoku site. Following that link takes you to a separate website, whose own privacy practices apply. You can play the Killer Sudoku game without opening it.
Changes
If future features materially change these practices, this page will be updated. No advertisements or trackers are included in this version.