Team Fortress 2
100.5 hrs last two weeks / 1775.3 hrs on record
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Source SDK
15.2 hrs last two weeks / 21.7 hrs on record
Left 4 Dead 2
3.5 hrs last two weeks / 112.1 hrs on record
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Half-Life 2: Deathmatch
2 hrs on record
Half-Life 2: Lost Coast
Left 4 Dead
588 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
