Originally Posted by Goggles

Ok really if you mean only on PC then I can really not recommend anything .
But if you are willing to except consoles games , then Half Life 1 for the PS2 is the game you can play .
Other than that .... there is ummm.... nothing much I can think up of .
No real coop games but lots of team multiplayers ..
if you can except those than your varaty is much bigger .