Left 4 Dead 2
5.4 hrs last two weeks / 15.3 hrs on record
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Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
Day of Defeat
Deathmatch Classic
Half-Life 2
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
Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Portal
0.1 hrs on record
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Ricochet
Source SDK
Team Fortress 2
166.3 hrs on record
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