   Co-operative multiplayer games
  These days there don't seem to be that many games you can do a truly co-operative game. By co-operative I'm meaning a proper campaign, or something similar to a single player game that can be played by at least 2 people. Games where you can play a skirmish both on the same side aren't exactly what I'm looking for.If you go old school, there's doom and doom 2, and doom 3 has a mod which supports co-op. Other than that I know of serious sam. baldur's gate and similar (like neverwinter nights and so on), but I'm open to suggestions. The less "series of vaguely connected battles" the game is, the better, but anything people want to say.I've found one site that seems to list co-op games, but I don't have time to go through the whole list downloading demos to see which include the kind of co-op play I have, and most of the games on the list don't have descriptions.So I turn to GDNet!   
  System Shock 2's later patches added a co-op multiplayer mode that is pretty awesome. It's LAN-only, so you'll have to trick it using Hamachi, but it's worth it.   ;  halo has very good coop.the outfit too, which i have only played the demo of, but im sure the coop is totally awesome.but way to few games have coop, thats for sure.   ;Try here (theres a part 2 and 3 too). Full Spectrum Warrior might be what you're after. Unfortunately theres a distinct lack of co-op games around, they mostly seem to be tacked on to single player games and suffer as a result.   ;  My problem with the way games handle multiplayer is that it's either fully competitive or fully cooperative.  I like the way Diablo handled it, where the game allows players to split up or stay together, either fighting over the treasure or just meeting up every once in a while for a hard battle.Good stuff :)   ;  Sniper Elite   ;  I maybe should have specified PC because that's all that's available to me :).I'll certainly look into System Shock 2, I think that might be abandonware now, although that's always sticky territory. I have halo, but I checked and it doesn't have a co-op mode on the PC. Thanks for the suggestions guys!   ;  quake 2 was always one of my favourites.bf2 has cooperative now but i don't think thats worth much.conflict desert storm 1+2, actually a crap games but a good laugh on ps2 with a friend and beer, good times.   ;  There is Sven Co-op for Half-Life(I love that game[both Sven and HL]). Then there is Tims Co-op for HL2(not all that great) and I think they are working on a Sven Co-op 2 for HL2 which looks pretty good.   ;  My all time favourite is Duke Nukem 3D, that was really fun :DAnd Diablo2, it's still fun to play it in the b.net.   