  I discovered multi-players games back around the mid nineties when we would spend numerous hours on DOOM with my co-workers, before going home (except for the CEO: we could hear him training all day in his office, as he was always taking a beating from us, the developpers). Then I came to urlLink subspace , on my own (I mean on the Internet) while we did a lot of urlLink Starcraft and urlLink Descent on our LAN. I wish we were back then as I stumble upon this Unreal Tournament Modification: urlLink Alien Swarm .
It seems to have all the ingredients I was (am? :-) ) looking for in those games, Co-Op being the major one. I cannot deny the influence of urlLink Aliens also, which was one of my favorite movies at that time. Unfortunately, one needs an Unreal Tournament installation to play it and I am from the generation before (I mean, I never had the hardware nor the time to buy and install it, being drawn by more serious problems at the time). I'll keep it marked as "to try one of these days"... Only have to get a grab on an Unreal Tournament install... 
