Cookie Policy
Last updated: March 1, 2025
This Cookie Policy explains what cookies and similar technologies SudokuMaster.org uses and how you can control them. By using our site, you agree to the use of essential cookies. You can opt out of analytics cookies using our cookie consent banner.
What are cookies?
Cookies are small text files stored on your device when you visit a website. We also use localStorage — a browser feature that stores data locally on your device without sending it to our servers. This is primarily how we save your game progress and preferences.
Cookies and storage we use
| Name / Key | Type | Purpose | Expires |
|---|---|---|---|
sg_theme |
Essential | Saves your chosen colour theme (Purple, Dark, Ocean, etc.) | Until cleared |
sg_sfx |
Essential | Saves your sound effects preference (on/off) | Until cleared |
sg_music |
Essential | Saves your background music preference (on/off) | Until cleared |
sg_track |
Essential | Saves your selected music track | Until cleared |
sg_solved |
Essential | Tracks the number of puzzles you have solved | Until cleared |
sg_streak |
Essential | Saves your daily puzzle streak count | Until cleared |
sg_lastPlay |
Essential | Records the date of your last play session for streak calculation | Until cleared |
sg_best |
Essential | Stores your best completion times per grid size and difficulty | Until cleared |
sg_savedGame |
Essential | Saves your current puzzle in progress so you can resume after closing the tab | 24 hours |
sg_autocheck |
Essential | Saves your auto-check mistakes preference | Until cleared |
sg_cookies |
Essential | Records whether you accepted or declined cookies in the consent banner | Until cleared |
| Google Analytics (_ga, _gid) | Analytics | Anonymised usage statistics — pages visited, session duration, country. Only set if you accepted cookies. | 2 years (_ga) / 24 hours (_gid) |
Essential vs analytics cookies
Essential cookies are required for the game to function correctly — saving your preferences, streak, and in-progress puzzle. These cannot be disabled without breaking the game experience.
Analytics cookies (Google Analytics) are optional. They help us understand how people use the site so we can improve it. They do not personally identify you. You can decline these using our cookie consent banner at the bottom of the page.
Third-party cookies
If analytics cookies are accepted, Google Analytics may set cookies on our behalf. See Google's Privacy Policy for details. If we serve Google AdSense ads, Google may set advertising cookies — you can opt out at adssettings.google.com.
How to control or delete cookies
- Browser settings: You can delete all cookies and localStorage data through your browser settings (usually under Privacy or History).
- Opt out of analytics: Click "Decline" on our cookie banner, or install the Google Analytics opt-out browser add-on.
- Delete your game data: Open browser DevTools → Application → Local Storage → sudokumaster.org → delete any key prefixed with
sg_.
Note: deleting essential storage (sg_* keys) will reset your streak, best times, theme preference, and saved game progress.
Changes to this policy
We may update this Cookie Policy. Changes will be posted on this page with an updated date. Continued use of the site constitutes acceptance.
Contact
Questions? Email us at sudokumaster.org@gmail.com