Team Fortress 2
36.8 hrs last two weeks / 65.8 hrs on record
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Left 4 Dead 2
6.2 hrs last two weeks / 28.9 hrs on record
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Audiosurf
0.5 hrs on record
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Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
Counter-Strike: Source
1.6 hrs on record
Day of Defeat
Deathmatch Classic
Half-Life
Half-Life 2
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Left 4 Dead
36.3 hrs on record
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Left 4 Dead 2 Demo
Left 4 Dead Authoring Tools
Ricochet
Source SDK
