Link Gmail to recover
News 2026-10-14: if you play with a name and password, you can now link your Gmail; if you forget your password, sign in with Google and it is the same account.
Official FAQ: with an account (name and password, or Google) your game is saved in the cloud and you can continue on any device. Guests can play right away, but nothing is saved.
English home UI copy (archived): if you linked Gmail, press Sign in with Google with that Gmail — same account. If you did not link it, recovery is not possible; create a new account and link Gmail from the prompt after signing in.
What the official privacy text says is stored
Legal text on the English home: account progress is stored in Google Firebase (player name and save). Google sign-in also stores your Google email for identification and does not show it to other players. Guests keep nothing outside the browser.
The same legal text says you can delete your account (and nickname, friends, records) when you want.