Amnesia: The Dark Descent Walkthrough: Exiting the Archives

Get out through the newly busted open door. Turn left and head on straight.
Yikes! Something just growled! Quickly run back to the Local History room
then into the secret room, and finally hide in the cabinet that you left
open! Wait for awhile until you think whatever it is has moved away.

Get out of the cabinet and exit the Local History room. Turn left and go
to where you heard the angry sound earlier. It’s gone! Now we can exit
the Archives. Turn right to where the piano is and move forward. You’ll
find another hallway to your right so go there.

You might suddenly encounter another sound from whatever it is. If you do,
quickly run back to the secret room and hide in the cabinet and then wait
a while. When you think it’s safe to go out, then go back to that hallway
and then you can finally exit back to the Entrance Hall! If you are near
the exit and you hear another sound, just make a run for it!