What data? Your nickname, your e-mail (if you create an account), your scores, and an approximate sign-in location (country/city, derived from the network, your IP address is never stored).
Where? Without an account: only in your browser local storage, on your device. With an account: nickname, e-mail and scores are stored encrypted on our server, for sync and the world leaderboard.
Cookies & trackers: no third-party cookies, no ads. Anonymous, cookieless audience stats (Vercel Analytics and an internal visit counter), no consent needed.
Retention: until you delete them (button below or clearing your browser data).
Your rights (GDPR): access, rectification and erasure, everything happens right here, immediately.
Online account: multi-device sync only happens with your explicit consent, given at sign-up.
Daily reminder: if you enable the bell, your browser gives us a technical notification address (no identity) that we keep with your language, nothing else. Turn it off anytime in your browser settings, the address is then removed from our servers on the next send.