Isn't. I change design all the time. I'm actually still stuck with windows because of those sucky games.

My brother's scores:

Beginner - 4 seconds
Intermediate - 25 seconds
Expert - 88 seconds

Screenshots to come when I fix his internet connection. While he's never broken his keyboard, the mice he uses are never quite the same. By the way, guesses like this at the end of a game are not uncommon, but that doesn't make them any less frustrating.