Counter-Strike: Source
32.6 hrs last two weeks / 356.6 hrs on record
Team Fortress 2
18.6 hrs last two weeks / 441.5 hrs on record
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Day of Defeat: Source
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Defense Grid: The Awakening
1.1 hrs on record
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Fallout 3
19 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
2.3 hrs on record
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Left 4 Dead 2
23.5 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead 2 Demo
Left 4 Dead Authoring Tools
Medieval II: Total War
40.9 hrs on record
Medieval II: Total War Kingdoms
Portal
2.4 hrs on record
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