Oh, god, it's 360 for a key? It better be worth it, I only have 275 knocks so far.
Also, something kinda strange: I got the second hat at 145 knocks, third hat and body at 220 knocks, and fourth at 275. Is it supposed to be like this...? Maybe I didn't check my knocks at the right time and skipped some, but I think I did it right...