AI War: Fleet Command
Aliens vs. Predator
Alien Swarm
Alliance of Valiant Arms
Battlefield: Bad Company 2
Borderlands
Borderlands DLC: Claptrap’s New Robot Revolution
Borderlands DLC: Mad Moxxi's Underdome Riot
Borderlands DLC: The Secret Armory of General Knoxx
Borderlands DLC: The Zombie Island of Dr. Ned
Bully: Scholarship Edition
Cities XL 2011
Command and Conquer 3: Tiberium Wars
Company of Heroes
Counter-Strike
Counter-Strike: Condition Zero
Counter-Strike: Condition Zero Deleted Scenes
Counter-Strike: Source
Counter-Strike: Source Beta
Dark Messiah Might and Magic Multi-Player
Dark Messiah Might and Magic Single Player
Day of Defeat
Day of Defeat: Source
Doc Clock: The Toasted Sandwich of Time
Earth 2160
Eufloria
F.E.A.R.
F.E.A.R. 2: Project Origin
F.E.A.R.: Extraction Point
F.E.A.R.: Perseus Mandate
Far Cry
Far Cry 2
Far Cry 2: Fortunes Pack
Foreign Legion: Buckets of Blood
Garry's Mod
Grand Theft Auto
Grand Theft Auto 2
Grand Theft Auto: Episodes from Liberty City
Grand Theft Auto: San Andreas
Grand Theft Auto: Vice City
Grand Theft Auto III
Grand Theft Auto IV
Half-Life
Half-Life 2
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Episode Two
Half-Life 2: Lost Coast
Hitman 2: Silent Assassin
Hitman: Blood Money
Hitman: Codename 47
Iron Grip: Warlord
Killing Floor
Killing Floor Mod: Defence Alliance 2
Left 4 Dead
Left 4 Dead 2
Mafia II
Manhunt
Max Payne
Max Payne 2: The Fall of Max Payne
Midnight Club II
Portal
Portal 2
Red Faction
Red Faction: Guerrilla
S.T.A.L.K.E.R.: Call of Pripyat
S.T.A.L.K.E.R.: Shadow of Chernobyl
Saints Row 2
Serious Sam Classic: The First Encounter
Serious Sam Classic: The Second Encounter
Serious Sam HD: The First Encounter
Serious Sam HD: The Second Encounter
Spiral Knights
Team Fortress 2
Team Fortress 2 Beta
Unreal Tournament 3: Black Edition
VVVVVV
Wild Metal Country
World of Goo
Zombie Panic Source