24-Hour Amnesia - A Collaboration Story

[Statyk]

EDIT: I'm stuck again- in the Scary Noises map, I can't find out what to do with the key you find in the second part of the map on top of a shelf (the hallway where the grunt shows up and you have to hide behind a wall of boxes and then run past him). I've tried using the key everywhere in the map, including the door in the same part of the level as where I found the key (directly down the hall from where I found it), but the key does not work anywhere. What do I do?

Try the door where the big staircase is in the center of the room. First floor, on the left (by the windows).