Cookie and Local Storage Policy
Last updated: 7 October 2026
Sfermish uses browser storage to remember functional settings. Advertising technologies may also use cookies or other device storage once advertising is enabled and, where required, after consent.
1. Sfermish first-party storage
| Key | Purpose | Storage |
|---|---|---|
sfermish-theme | Remembers the light/dark theme selected by the user. | Local storage, until changed or cleared. |
sfermish-nickname | Remembers the last nickname on the device for convenience. | Local storage, until changed or cleared. |
bullet-nickname | Legacy key read only for backwards compatibility with older versions of the game. | May remain from an older release until cleared by the browser/user. |
sfermish-ads-next-interstitial-at-v1 | Frequency control for interstitial advertising. | Persistent storage only when the advertising provider indicates that the relevant storage consent permits it; otherwise session memory only. |
sfermish-ads-interstitial-pending-v1 | Prevents a due interstitial from being silently skipped by a page refresh. | Persistent storage only when the advertising provider indicates that the relevant storage consent permits it; otherwise session memory only. |
2. Google advertising storage
Sfermish is preparing to use Google AdSense and Google H5 Games Ads. Once enabled, Google and participating advertising technology providers may use cookies, local storage, identifiers, IP addresses and similar technologies for ad delivery, measurement, fraud prevention and, where the user agrees, personalization.
Google explains its use of advertising cookies at How AdSense uses cookies and its broader partner-site processing at Google partner sites.
3. Consent choices
For users in regions where consent is required, Sfermish intends to use Google's certified Consent Management Platform (CMP) through AdSense Privacy & messaging. The CMP provides choices to consent, refuse consent, or manage purposes and vendors.
If the Google consent manager is not active yet, this button will become available when advertising/CMP integration is enabled.
4. Browser controls
You can also remove Sfermish local storage using your browser's site-data controls. Doing so may reset the saved nickname, theme and advertising frequency state. Browser settings can also restrict cookies, although blocking required third-party advertising storage may reduce or prevent ad delivery.
5. More information
See the Privacy Policy for information about server-side processing, Highscore records, skins and technical logs.