Last updated: May 27, 2026
Cookie Policy
This Cookie Policy describes the use of cookies, localStorage and similar technologies by Sudoku Arena for technical functionality, preferences, security and optional consent-based analytics.
1. What cookies and similar technologies are
Cookies are small files saved by the browser while browsing. Similar technologies, such as localStorage, allow the site to store information on the user’s device.
Sudoku Arena uses these technologies to make the service work, remember preferences, maintain continuity in the gaming experience and, only with prior consent, collect optional analytics.
2. Cookies and storage used by Sudoku Arena
| Name | Type | Purpose | Approximate duration | Basis |
|---|---|---|---|---|
| locale | Technical/preference cookie | Remembers the selected language and supports localized browsing. | Up to 365 days or according to the site configuration. | Necessary or user-requested preference |
| countryCode | Technical/preference cookie | Stores the approximate country to prefill the country selection or improve the initial experience. | Session or duration set by the site. | Necessary or technical preference |
| theme | localStorage | Remembers the visual preference, such as light or dark theme. | Until the user changes the preference or clears browser data. | User-requested preference |
| sa_user_id | localStorage | Stores the user or guest identifier to allow continuity of the gaming experience. | Until logout, local deletion, account deletion or browser cleanup. | Necessary for the service |
| sa_access_token | localStorage | Stores the signed access token used to authenticate API requests. | Until logout, local deletion, account deletion, token expiry or browser cleanup. | Necessary for the service |
| sa_profile | localStorage | Stores some profile information locally to make the user experience faster and more continuous. | Until logout, profile update, account deletion or browser cleanup. | Necessary or experience improvement |
| sa_analytics_consent | localStorage | Stores the user’s choice about optional analytics. | Until the user changes the choice or clears browser data. | Consent or refusal expressed by the user |
| sa_analytics_distinct_id | localStorage | Pseudonymous identifier used for optional analytics only after consent. | Until consent withdrawal, preference reset or browser cleanup. | Analytics consent |
3. Technical cookies and preferences
Technical cookies and storage are used to make language, country, theme, application session, local saving and continuity of the user experience work. When they are strictly necessary or requested by the user, they may be used without prior consent, while still requiring proper notice.
Disabling or deleting technical cookies and localStorage may result in loss of preferences, local logout, inability to resume a game or malfunctioning of some features.
4. Optional analytics
Sudoku Arena uses PostHog EU for optional analytics only if the user gives consent. Analytics help understand how the site is used and improve features, content and service stability.
Analytics events may include information such as page or section visited, language, interactions with game features and pseudonymous technical data. They are not intended for advertising or behavioral marketing purposes.
The user may refuse or withdraw consent to analytics without losing access to the site’s essential features.
5. Marketing and advertising profiling
Sudoku Arena does not use advertising cookies, advertising pixels or third-party marketing profiling tools.
If marketing or profiling tools are introduced in the future, this Cookie Policy will be updated and, where required, the user will be able to give specific consent.
6. Third-party services
- Railway provides hosting and infrastructure services and may process technical logs, IP addresses and data generated by the use of the service.
- Cloudflare may process technical browsing data for security, performance, traffic protection and approximate country detection. Depending on the configuration, Cloudflare may set technical cookies or similar tools for security purposes.
- PostHog EU processes optional analytics events only if the service is active and the user has given consent.
- Resend is used to send technical emails, such as temporary access codes, and is not a web tracking tool.
7. Consent management
The privacy banner or panel allows optional analytics to be accepted or refused. The choice is saved in the browser to avoid asking again on every visit.
Withdrawing consent prevents new analytics submissions and may result in the removal of analytics identifiers saved in the browser, according to the features available on the site.
The user can also clear cookies, localStorage and other site data from the browser settings.
8. How to disable cookies and storage from the browser
The user can manage cookies and site data from the settings of the browser being used. The available options vary depending on the browser and device.
Completely disabling cookies or clearing localStorage may prevent some Sudoku Arena features from working correctly, including access, preferences, game recovery and continuity of the guest experience.
9. Updates and contacts
This Cookie Policy may be updated if new cookies, analytics tools, third-party services, similar technologies or changes to the consent system are introduced.
For questions about the Cookie Policy, you can write to [email protected]. For privacy requests, you can write to [email protected].