This is a short list of the games this Group will be playing:

Alien Swarm
Counter-Strike
Counter-Strike: Source
Synergy
F.E.A.R. 2
Kane & Lynch 2
Left 4 Dead
Left 4 Dead 2
Dystopia
Red Alert 3
Team Fortress 2
Insugercy
Battlefield 2
Battlefield Bad Company 2
Killing Floor
Garry's Mod
Quake (Any Version)
Half-Life 2: Deadmatch
America's Army 3
Call of Duty: Modern Warfare
Call of Duty: Modern Warfare 2
Call of Dufy: Black Ops

Any many more!
*Notice: You DON'T have to have all those game do some are very expensive, and some others are just free and very fun, we just focused on the mainly games that ppl play.

Greatings.