i would have to say AOL. i'm still working on the game since i downloaded it on the ambassador program, and i found myself getting frustrated at annoying enemies like tinsuits and the flying horseheads. they take away your experience points and even if you kill them, they give you no experience at all and you would probably see another one in the next 2 seconds. i also just hated it when i was 10xp or so away from a level, some enemy comes around and kills me. i hate that, so much.