I got this from my first try, believe it or not. So, no, I don't think it's based on guessing - just the kind of twisted RPG logic. It was fun while it lasted though. Too bad it's so short.
An amazing game. I specifically liked the subtle, yet quite overt hints. Although, I have to admit, I am not accustomed to sounds in a MUD, so I jumped a little at that vampire-appearing scene :D
Anyway, great game, and thanks for the tip.