SECURITY-HINT: Please do not start to post any login-details here. As this topic is publicly visible, anyone could steal them.
Contact a moderator with the account you log want to login (== your real username) and the account you login with instead (== the wrong account). The best person to contact is @nick, as he is one of the owners of CodeCombat. This post notifies him of the issue, so you should soon receive help.
Then try logging in with G+. It should ask you which Google account to log into. If you pick the correct Google account and it still logs you into this other first-level account, then somehow the association is incorrect and we’ll have to set up a password for you to get in. If you remember the username or password of the intended account, please message me.