Left 4 Dead 2
2.5 hrs last two weeks / 7.1 hrs on record
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Team Fortress 2
0.3 hrs last two weeks / 153 hrs on record
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Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
Counter-Strike: Source
Day of Defeat
Day of Defeat: Source
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Deathmatch Classic
Garry's Mod
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Half-Life
Half-Life 2
40 hrs on record
Half-Life 2: Deathmatch
Half-Life 2: Episode One
2.6 hrs on record
Half-Life 2: Episode Two
4 hrs on record
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Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Half-Life: Source
Half-Life Deathmatch: Source
Left 4 Dead
9.9 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
Portal
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Ricochet
Serious Sam HD: The First Encounter
1.8 hrs on record
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SiN 1
SiN 1 Multiplayer
SiN Episodes: Emergence
Source SDK
STALKER: Shadow of Chernobyl
42.6 hrs on record
