Team Fortress 2
4.1 hrs last two weeks / 29.1 hrs on record
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Audiosurf
8.1 hrs on record
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Commander Keen Complete Pack
Counter-Strike: Source
Doom 2
Doom 3
Doom 3: Resurrection of Evil
Final Doom
Grand Theft Auto
Grand Theft Auto 2
Grand Theft Auto 3
Grand Theft Auto: San Andreas
Grand Theft Auto: Vice City
GRID
2.2 hrs on record
Half-Life 2
Half-Life 2: Deathmatch
0.2 hrs on record
Half-Life 2: Episode One
Half-Life 2: Episode Two
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Half-Life 2: Lost Coast
Half-Life: Source
Half-Life Deathmatch: Source
Heretic: Shadow of the Serpent Riders
Hexen
Hexen 2
Hexen: Deathkings of the Dark Citadel
Juiced 2: Hot Import Nights
Killing Floor
3.5 hrs on record
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Killing Floor Mod: Defence Alliance 2
Killing Floor SDK
Left 4 Dead
2.3 hrs on record
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Left 4 Dead Authoring Tools
Master Levels of Doom II
Portal
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Quake
Quake 3 Arena
Quake 3 Team Arena
Quake II
Quake II: Ground Zero
Quake II: The Reckoning
Quake Mission Pack 1: Scourge of Armagon
Quake Mission Pack 2: Dissolution of Eternity
Return to Castle Wolfenstein
Source SDK
Spear of Destiny
Ultimate Doom
