Left 4 Dead 2
9.2 hrs last two weeks / 9.2 hrs on record
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Counter-Strike: Source
101.8 hrs on record
Half-Life 2
16.3 hrs on record
Half-Life 2: Episode One
4.3 hrs on record
Half-Life 2: Episode Two
5.6 hrs on record
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Half-Life 2: Lost Coast
0.3 hrs on record
Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Mass Effect
2.1 hrs on record
Portal
4.4 hrs on record
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Source SDK
Starwars: Knights of The Old Republic
31.3 hrs on record
Team Fortress 2
175.3 hrs on record
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