Become Gordon Freeman

[Pandemoneus]

Yeah, I got the crowbar!

Spoiler below!

You need 200 total.
50 are in the desk in the room where you start. (the lever to open it is behind the painting when you leave the room).
50 in the room with the crosses.
50 in the room with the flesh things, jump on the one with the rock to reveal it.
10 are in that whine shelf.
10 are in the middle chest of the drawer (pull it a bit up, then you will see it).
10 are behind the other chest at the ground.
10 are behind the left huge storage box.
10 are on top of the book shelf, you have to jump all the way up to get them.