The arcade usually defaults so that guests can view the games but not play them. I prefer guests to stay, so have allowed anyone to play in the arcade. However, guest scores will not be registered so don't go getting your personal best without logging in first because I'll just laugh
good idea.... shame i didnt know that when i played the first couple of games in there... would have had high score in break out.. couldnt be azzed to play it again after! lol