Left 4 Dead 2
12.6 hrs last two weeks / 12.6 hrs on record
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Team Fortress 2
10.9 hrs last two weeks / 226.8 hrs on record
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Counter-Strike: Source
0.1 hrs on record
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
Left 4 Dead
24.8 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
Portal
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Source SDK
Unreal Tournament 3 Black
2.5 hrs on record
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