Privacy
Last updated July 26, 2026
SudokuGridBase is built so you can fill a grid without creating an account or uploading a save file. The puzzle state lives in your browser. Hint and Check work run in a Web Worker on your device. Closing the tab does not send your grid to us as a “player profile.”
What stays on your device
- Current board layout, givens, and your filled digits
- Pencil (candidate) marks for empty cells
- Difficulty / variant for the active puzzle when applicable
- Daily challenge seed markers for the calendar day you played
- Sound on/off preference (default off until you enable it)
- Timer and any short local progress UI state for the side panel
Clear site data, use a private window, or switch browsers, and those values start fresh. We cannot restore a grid you wiped — it was never on our servers.
Accounts
There are none. No sign-up, no password, no cloud sync of your board, and no mailing-list wall before the first digit. If you install the site as a PWA on a device that supports it, the install still points at this origin; it does not create a SudokuGridBase user database.
Analytics
We use Google Analytics 4 (measurement ID G-X7FP3X4DXD) for aggregate traffic — pages viewed, approximate region, device type, browser, referral source. Analytics is not tied to your board state, pencil marks, or an account (we do not have accounts). You can play with analytics blocked.
Google's privacy policy: policies.google.com/privacy. Opt out with Google's Analytics Opt-out Browser Add-on.
Ads
Display ads are not enabled today. Placeholders you may see in the layout are empty slots, not live networks. If ads turn on later, third-party networks may set cookies under their own policies, and this page will be updated. Ads will not sit on top of the playable grid.
What may leave the device
- Email you send us voluntarily (URL, screenshots, description of a bug)
- Aggregate Google Analytics 4 traffic data — not grids or pencil marks
- Normal host and security logs (IP, user agent, path, timestamp) for abuse prevention — not used to rebuild your puzzle
If you write to contact@sudokugridbase.com, we receive whatever you put in the message. We use that to reply or fix bugs — not to build a marketing list of “sudoku players” or sell addresses.
Children
The site is a general-audience puzzle. We do not knowingly collect personal information from children as a product feature. Gameplay data is local. If a parent believes a child emailed us personal details, contact us and we will delete that mail from our inbox when we can.
Changes
If storage behavior, analytics, or ads change in a way that matters, we update this page and the “Last updated” date. Acceptable use lives on terms. Questions: contact or contact@sudokugridbase.com.