I didn't see any troll here... XD
Below the lake
where's the chamber of secrets?!
There's also a small problem with the kitchen. I read in an interview that the Hufflepuff common room is actually next door to the kitchen, and that would make it improbable for the kitchen to be in the dungeon.
some of the steps on this floor don't mach up with the floors above or below
So, where's the Slytherin common room?