Play at your own pace.
Last updated: 22 September 2026.
Using XNBack
Alex Botham, Finland, operates XNBack. Contact help@xnback.com with questions about these terms. These terms cover the website and iPhone app.
Free to play
The browser game and iPhone app are free, without ads or paid features. Apple’s terms also apply when you use its services to download the app.
Browser results and app accounts
Browser results exist on the current page only. Leaving the page or reloading clears them. The browser game does not save results to an app account.
App accounts provide saved progress and social features. Keep your sign-in details safe and use only accounts you are entitled to access. You can request account deletion from Settings. See Privacy for how we handle your data.
Play fairly
Do not harass other players, impersonate someone, upload unlawful content, or interfere with the service. Do not submit fabricated scores or try to access another player’s account. We may restrict accounts to address abuse or security risks. Contact support if you think a restriction is wrong.
Service availability
Updates, maintenance, or failures can interrupt access. Features may change as we improve the app. Keep your app up to date and tell us if something goes wrong.
A game, not a health assessment
A score describes performance in one round. It is not a measure of intelligence, a diagnosis, a treatment, or a promise of benefits outside the game. Stop or take a break whenever you wish.
Your rights
These terms do not limit rights that the law gives you. We will update this page when the terms change and bring important changes to your attention through the website or app.