unreal championship is different, back in around jan or feb maybe even march i figured out how to hack unreal. my hacks were possible in single player, split screen, and system link. as far as i could see it would also be possible to do so onxbox live since it was infact compatible with system link. i however didn't post all my findings as i didn't want poeple cheating online, seemed wrong. I also never finished my work to get the cheats working online other than some name hacks and stuff. i didn't wanna be known as the guy that could only win cheating, and i knew if i found out how to get it working online i'd definately wanna use it.
anyway, halo will not work with any cheats implemented unless both the games are the exact same version. ie, if one has a trained version and the other does not it will not work