Left 4 Dead 2
2.2 hrs last two weeks / 29 hrs on record
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Aces of the Galaxy
0.1 hrs on record
Audiosurf
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Borderlands
19.4 hrs on record
Braid
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Call of Duty 4: Modern Warfare
Counter-Strike
Counter-Strike: Source
1 hrs on record
Day of Defeat
Deathmatch Classic
Defense Grid: The Awakening
33.8 hrs on record
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Dragon Age: Origins
82.2 hrs on record
Geometry Wars
GRID
Half-Life
Half-Life 2
0.1 hrs on record
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: Blue Shift
Half-Life: Opposing Force
Half-Life Deathmatch: Source
Killing Floor
9.7 hrs on record
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Killing Floor Mod: Defence Alliance 2
Killing Floor SDK
Left 4 Dead
72.2 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead Authoring Tools
Light of Altair
11.4 hrs on record
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Mass Effect
20.5 hrs on record
Plants vs. Zombies
19.7 hrs on record
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Portal
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Ricochet
Shadowgrounds
4.5 hrs on record
Source SDK
Team Fortress 2
2.9 hrs on record
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Team Fortress Classic
Torchlight
7.6 hrs on record
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Torchlight Editor
Trine
6.5 hrs on record
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