Audiosurf
22 hrs last two weeks / 52 hrs on record
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Killing Floor
2 hrs last two weeks / 41 hrs on record
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Half-Life 2: Episode Two
0 hrs last two weeks / 0 hrs on record
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Half-Life 2
Half-Life 2: Deathmatch
1 hrs on record
Half-Life 2: Episode One
Half-Life 2: Lost Coast
Killing Floor SDK
Left 4 Dead
20 hrs on record
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Left 4 Dead 2 Demo
Left 4 Dead Authoring Tools
Multiwinia
3 hrs on record
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Portal
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Source SDK
Team Fortress 2
4 hrs on record
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