On level 19 of medium difficulty. I don't even consider going any higher than that since it would just piss me off anyway. Once I hit the point where I'm rude to my wife because of a game she shuts me down.
Haha, you are not alone my friend. You have no idea how many times I yell and get pissed at the game. Especially when I have to do the same part 15 times till I get past it.