mrstickball on 04 September 2008
You can't get the Hard or Insane difficulties until you beat it on normal. The game is designed like Mass Effect: It requires multiple playthroughs. However, unlike ME, it rewards you with new dungeons and EQ on harder playthroughs.
As for the puzzle:
Use Charm, and command the bat + snake to the door. When they are near the door, examine the door to enter.
Back from the dead, I'm afraid.
