When you’re playing the versus mode in Left 4 Dead, the zombie’s ability to see the outline of your character through the walls gives them a huge advantage while planning their attacks. There are some things you can do to make that outline disappear so you can move in secret, but what those things are have been subject to debate online. Finally, someone on the Steam forum has outlined exactly what you can and can’t do if you want to remain unseen.

via Your guide to moving unseen in Left 4 Dead.

I really, really need a computer that can handle this game!!

ARGH!! Not being able to play this game is driving me mad… 🙁