Left 4 Dead 2
17.1 hrs last two weeks / 76.1 hrs on record
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Team Fortress 2
16 hrs last two weeks / 20.6 hrs on record
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Counter-Strike
Counter-Strike: Source
Day of Defeat
Day of Defeat: Source
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Deathmatch Classic
Defense Grid: The Awakening
8.4 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
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Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Half-Life: Source
Half-Life Deathmatch: Source
Killing Floor
46.7 hrs on record
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Killing Floor Mod: Defence Alliance 2
0.4 hrs on record
Killing Floor SDK
Left 4 Dead
151 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead Authoring Tools
Nation Red
2.2 hrs on record
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Portal
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Ricochet
Source SDK
Speedball 2 - Tournament
Team Fortress Classic
