Counter-Strike: Source
6 hrs last two weeks / 559.6 hrs on record
Call of Duty: Modern Warfare 2 - Multiplayer
3.3 hrs last two weeks / 23.6 hrs on record
Aion Collectors Edition
Bullet Candy
0.5 hrs on record
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Call of Duty: Modern Warfare 2
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Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
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
Half-Life: Source
Half-Life Deathmatch: Source
Left 4 Dead
3.9 hrs on record
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Left 4 Dead Authoring Tools
Portal
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Source SDK
Street Fighter IV
4.6 hrs on record
Team Fortress 2
12.6 hrs on record
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