Team Fortress 2
23.3 hrs last two weeks / 157.5 hrs on record
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Left 4 Dead 2
5.6 hrs last two weeks / 5.6 hrs on record
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Left 4 Dead
5.5 hrs last two weeks / 183.2 hrs on record
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Call of Duty: Modern Warfare 2 - Multiplayer
2 hrs last two weeks / 109.8 hrs on record
Call of Duty: Modern Warfare 2
2 hrs last two weeks / 57.4 hrs on record
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Day of Defeat: Source
142.4 hrs on record
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Half-Life
7.7 hrs on record
Half-Life 2
15.5 hrs on record
Half-Life 2: Deathmatch
Half-Life 2: Episode One
2.9 hrs on record
Half-Life 2: Episode Two
4.9 hrs on record
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Half-Life 2: Lost Coast
0.3 hrs on record
Half-Life: Opposing Force
2.1 hrs on record
Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead Authoring Tools
Portal
3.6 hrs on record
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Source SDK
