Left 4 Dead
3 hrs last two weeks / 395 hrs on record
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Audiosurf
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Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
Counter-Strike: Source
18 hrs on record
Grand Theft Auto IV
131 hrs on record
GTR Evolution
Half-Life
1 hrs on record
Half-Life 2
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Episode Two
1 hrs on record
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Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Left 4 Dead Authoring Tools
Portal
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RACE 07
3 hrs on record
Source SDK
Team Fortress 2
2 hrs on record
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