Cheat (without object):
1)to practice fraud or deceit
2)to violate rules or regulations
3)to take an examination or test in a dishonest way, as by improper access to answers.
4)to be sexually unfaithful
Game cheats would surely apply to #2 more than anything. You could say cheats always violate a "rule" of some sort, even paintball mode in Goldeneye. You could even count codes that increase the difficulty as cheating! After all, that is not part of the game's rules.
So, it all depends on how you define cheating.
--
"Ah, a party! We haven't had one of those. So...what is a party?"
"Well, you drink punch and eat CAKE! ...I think."