Left 4 Dead 2
23.7 hrs last two weeks / 89.8 hrs on record
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Left 4 Dead 2 Authoring Tools
3.2 hrs last two weeks / 3.2 hrs on record
Day of Defeat: Source
1 hrs last two weeks / 258.7 hrs on record
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Audiosurf
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Commander Keen Complete Pack
Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
0.1 hrs on record
Counter-Strike: Source
3.4 hrs on record
Day of Defeat
Deathmatch Classic
Doom 2
Doom 3
Doom 3: Resurrection of Evil
Drug Wars
0.8 hrs on record
Earth 2160
Final Doom
Garry's Mod
12.3 hrs on record
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Half-Life
Half-Life 2
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Episode Two
0.1 hrs on record
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Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Half-Life: Source
Half-Life Deathmatch: Source
Heretic: Shadow of the Serpent Riders
Heroes of Annihilated Empires
Hexen
Hexen 2
Hexen: Deathkings of the Dark Citadel
Left 4 Dead
36.6 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Demo
7.9 hrs on record
Left 4 Dead Authoring Tools
Master Levels of Doom II
Mirror's Edge
1.3 hrs on record
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
Ricochet
S.T.A.L.K.E.R.: Clear Sky
SiN 1
SiN 1 Multiplayer
SiN Episodes: Emergence
Source SDK
Spear of Destiny
Team Fortress 2
4.8 hrs on record
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Team Fortress Classic
Ultimate Doom
