Amnesia: The Great Work - FULL RELEASE

[klieur]

I didn't understand anything at the chapter 3 , after exploding the wall in the laboratory, i go down (with maybe 20 try for do it ) and the enter the clockwork.
There were 2 area in the left and the right, there were like puzzle, just after I jump to go to the vault , a monster attack me, I run, at the end there were a ladder and .... chapter 4, without solving anything in the clockwork (and i use my acid in the laboratory without doing anything with it) , bug ?

(sorry if my english is bad )