Team Fortress 2
17.3 hrs last two weeks / 161.9 hrs on record
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Source SDK
9.4 hrs last two weeks / 140.1 hrs on record
Left 4 Dead 2
8 hrs last two weeks / 47.5 hrs on record
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Left 4 Dead Authoring Tools
3.2 hrs last two weeks / 31.4 hrs on record
Left 4 Dead
0.2 hrs last two weeks / 49.1 hrs on record
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Half-Life 2
29.5 hrs on record
Half-Life 2: Deathmatch
2.2 hrs on record
Half-Life 2: Episode One
Half-Life 2: Episode Two
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Half-Life 2: Lost Coast
0.6 hrs on record
Left 4 Dead 2 Demo
5.8 hrs on record
Portal
6.8 hrs on record
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