Why cant I move up in halo 3 I was playing today from about 10 - 1 and I won every single game, (Yea no joke I partied up with this guy and we owned) but for some reason I can't seem to move up from a lv. 17. I do good usually like atleas3t 12 kills a game and some games it depends how much I die, you know if they are just being rocket or shotgun whores. But he moved up like 6 lvs and I didn't move up 1 single level. Anyone know why?