Privacy and cookies
Last updated: 24 October 2026.
What the game stores
| Name | Where | Why | How long |
|---|---|---|---|
sid | Cookie | A random ID that keeps your games, stats and leaderboard entry. Needed for the game to work. | 400 days |
4ng.mode | Your browser | Remembers Daily or Practice mode. | Until you clear it |
4ng.consent | Your browser | Remembers your answer to the cookie banner. | Until you clear it |
_ga, _ga_* | Cookie | Google Analytics. Set only if you accept analytics cookies. | Up to 2 years |
What the server keeps
Your guesses and results, and the name and country you choose for the leaderboard. Your name and country are public on the leaderboard. Your IP address is used briefly in memory to stop abuse and is not saved.
Google Analytics
If you accept analytics cookies, Google Analytics 4 (Google Ireland Ltd. / Google LLC) records which pages you open, your approximate location, your device type and when you solve a code. Advertising features and Google Signals are off. If you decline, no analytics cookies are set and Google receives only anonymous signals without identifiers.
You can change your choice at any time with Cookie settings at the bottom of the game page.
Your rights
You can ask to see or delete your data. Write to us in the 4 Numbers Telegram chat. Clearing cookies for this site also ends the link between your browser and your past games.