2.2) I don't remember my password and the email address registered with my account is not valid anymore.
In this case, you can try to send us an email to email@example.com and describe as many information about your account as possible. If we decide that the mentioned account really belongs to you (which is never guaranteed and, honestly, there is a low chance at all, due to security reasons), you will be sent a new password. Otherwise, the only option is to open a new BrainKing account.
(hide) If you want to play a game with an opponent of a similar level, you can define a required BKR range for a new game invitation. Then nobody with a BKR outside this range will be able to see/accept it. (Katechka) (show all tips)