Source SDK
15 hrs last two weeks / 1068 hrs on record
Left 4 Dead Authoring Tools
14 hrs last two weeks / 26 hrs on record
Team Fortress 2
11 hrs last two weeks / 652 hrs on record
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Left 4 Dead 2
9 hrs last two weeks / 28 hrs on record
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Left 4 Dead
7 hrs last two weeks / 27 hrs on record
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Portal
2 hrs last two weeks / 17 hrs on record
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Unreal Tournament 3 Black
0 hrs last two weeks / 40 hrs on record
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Borderlands
80 hrs on record
Braid
6 hrs on record
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Counter-Strike: Source
Garry's Mod
44 hrs on record
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Half-Life
Half-Life 2
347 hrs on record
Half-Life 2: Deathmatch
Half-Life 2: Episode One
0 hrs on record
Half-Life 2: Episode Two
13 hrs on record
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Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Half-Life: Source
Half-Life Deathmatch: Source
Left 4 Dead 2 Demo
6 hrs on record
Team Fortress Classic
