Cookie policy
Pages on Sudoku Online do not set cookies for visitors. The game stores your settings, board, statistics and consent choice in your browser’s local storage. Cookies from Google can appear only if you allow Google Analytics or advertising, or if you are in a region where they load by default.
This page lists what is stored and how to change it. It was last updated on 28 October 2026.
What is the difference between cookies and local storage?
Cookies are small files that a website or a third party places in your browser and that are sent back with later requests. Local storage is a space in your browser that a page can read and write only on your own device, and its contents are not sent anywhere unless a page sends them. This site uses local storage for the game and does not use first-party cookies for visitors.
What does the site store on your device?
| What | Where | Purpose | How long |
|---|---|---|---|
| Game settings | Local storage | Remember options such as theme, large digits and mistake feedback | Until you clear the site’s data |
| Saved board | Local storage | Let a paused or interrupted game resume | Until you finish, start another or clear data |
| Statistics and daily streak | Local storage | Show your results and streak | Until you clear the site’s data |
| Consent choice (so:consent) | Local storage | Remember whether you accepted analytics and advertising | Until you change it or clear data |
None of this is sent to us. The site’s own event counting uses no cookies and no identifiers, and it is described in the privacy policy.
Which cookies can appear from Google?
| Provider | Purpose | When it can appear |
|---|---|---|
| Google Analytics | Measure how the site is used, using cookies such as _ga and one named after the property, which last up to two years by default | After you agree, where consent is required; elsewhere unless you decline or send Global Privacy Control |
| Google AdSense and its advertising partners | Serve and measure ads and, if allowed, personalize them | Only when advertising is on and your choices allow it; in the EEA, UK and Switzerland also only after Google’s consent message is accepted |
The exact cookies and their lifetimes are set by Google and can change, so this page describes them by purpose. Google publishes details in its own documentation.
What about staff?
People who run the site sign in with an account, which sets a session cookie, so_session, that is used only for staff and is not set for visitors.
How can you change your choices?
- Use the Privacy choices control in the footer, where it is shown, to change your consent.
- Send Global Privacy Control from your browser or an extension. The site then treats analytics and advertising as declined.
- Delete cookies and site data in your browser settings. This also removes your saved settings, board, statistics, streak and consent choice.
- Use your browser’s cookie controls or your device’s advertising settings.
Declining analytics or advertising does not stop you from playing, and it does not remove the game’s own local storage.
Questions?
Write to [email protected] or use the contact page.
Related: Privacy policy, Terms of use and About Sudoku Online.