I could start the next level right away when I didn't had the Fatigue curse. Waiting now for fatigue to end to go to level 11. So far they have all been the same.
Oh, I'm also working on this: https://docs.google.com/spreadsheet/ccc?key=0AjqMSazc1Er3dERCcUZOTkhJM1RyN3NQTlJ2SU1ncEE&usp=sharing#gid=0
It's only my own data (combined a bit with this: neopets.com/~camia_quroc and JellyNeo's solutions) so the percentages might still be off since that is ONLY my own data, if you have foresight however, you can use it to pick the right option as you can see who is behind the door.
On tab 2 there is a very small, nothing like TDN's page with the effect of some Curses that might mess up the correct answer.