Level 8 + 1cc? Just some of the fighter series then.
kof94 - kof2003
ff 1 - motw
both breakers games
buriki one
With the fighting games, after a certain point you're really just exploiting holes in the AI. It really just teaches you bad habits as far as versus play is concerned, but it can be fun to get past the AI's "cheapness" with some creativity.