Team Fortress 2
61.7 hrs last two weeks / 332.2 hrs on record
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Left 4 Dead 2
0.7 hrs last two weeks / 23.2 hrs on record
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Counter-Strike: Source
0.6 hrs last two weeks / 56.5 hrs on record
Aion Collectors Edition
Bioshock
Call of Duty 4: Modern Warfare
Commander Keen Complete Pack
Company of Heroes
Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
Crysis Warhead
Crysis Wars
Darwinia
Day of Defeat
Day of Defeat: Source
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Deathmatch Classic
Defcon
Doom 2
Doom 3
Doom 3: Resurrection of Evil
F.E.A.R. 2: Project Origin
10.1 hrs on record
Fallout 3
Far Cry 2
Far Cry 2: Fortunes Pack
Final Doom
Garry's Mod
2.4 hrs on record
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Half-Life
Half-Life 2
0.8 hrs on record
Half-Life 2: Deathmatch
0.1 hrs on record
Half-Life 2: Episode One
0.1 hrs on record
Half-Life 2: Episode Two
1.3 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
Hexen
Hexen 2
Hexen: Deathkings of the Dark Citadel
Killing Floor
0.5 hrs on record
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Killing Floor Mod: Defence Alliance 2
Killing Floor SDK
Left 4 Dead
300.1 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead 2 Demo
0.6 hrs on record
Left 4 Dead Authoring Tools
Master Levels of Doom II
Painkiller: Gold Edition
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
SiN 1
SiN 1 Multiplayer
SiN Episodes: Emergence
Source SDK
Spear of Destiny
Team Fortress Classic
The Ship
The Ship Tutorial
Titan Quest
Titan Quest: Immortal Throne
Ultimate Doom
Wolfenstein
11.5 hrs on record
