Sorry if this ruins anyone's parade, but challenge lobbies are fake! People will say "Post your GT and sub my YT" Or something like that. Some people will say, you need to pay to join challenge lobbies. When you pay, hes going to KICK you from the game so YOU won't play! There you go, you got scammed. All I know, the host just wants you guys to play in his Lobby. You guys gotta believe me, I've been trying to get into one the WHOLE day. I wasted 1 day of my life. So yeah, this is just a HEADS UP! BUT: XP LOBBIES ARE REAL! There not hard to get in, also. So yeah, again this is just a heads up! Thanks for reading! ;)