For people who have already uninstalled the app. In the app the same thing is under Online → Account → Remove my account. There is no password: a six-digit code goes to the email on the account, and the deletion is one confirmation after that.
A six-digit code was sent to . It works for ten minutes.
You are signed in as . Deleting the account does this, at once and for good:
This cannot be undone. To play online again later you would make a new account.
Your account has been deleted. The email, profile and avatar are gone and every sign-in has ended; your games stay under the anonymous name .
Thank you for playing. The bots, the puzzles and the tutorial need no account, so the game is still yours to play.