Left 4 Dead 2
4 hrs last two weeks / 12 hrs on record
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Darkest Hour
Half-Life 2
Half-Life 2: Episode One
Half-Life 2: Episode Two
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Half-Life 2: Lost Coast
Left 4 Dead
71 hrs on record
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Left 4 Dead Authoring Tools
Mare Nostrum
0 hrs on record
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Mare Nostrum Dedicated Server
Portal
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Red Orchestra
3 hrs on record
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Source SDK
Sword of the Stars
59 hrs on record
Sword of the Stars: Argos Naval Yard Expansion
Team Fortress 2
11 hrs on record
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