Ok, Chell needs a hat too XDD
Please, someone hear me!
This avy would be hard to Luigify, it's eyes will be covered!
There seem to be none.
Also, the gold you gather in multiplayer is transfered to your single player game. Knowing that it is like XP and allow you to get better equipment in SP, I can see that beeing helpful. That being said, I only gathered like 40G in 15 minutes of single player MP (yes, that's the good thing about it to, 1 to 4 players can play this mode :]).
About those saying that it is barebone, I don't have this feeling. I can see it being really challenging, you have 3 different set of rules, and the floors has several rooms (like 8 or 9). As far as I have played, it's always the same level, but the ghosts become stronger each time. It reminds me a bit of that tower mode in this LOTR Hack and Slash made after the 2nd movie (if I recall well).
Game is delivering so much.