Borderlands
5 hrs last two weeks / 29 hrs on record
The Witcher: Enhanced Edition
3 hrs last two weeks / 14 hrs on record
Audiosurf
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Bioshock
Braid
7 hrs on record
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Counter-Strike: Source
Day of Defeat: Source
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Far Cry 2
Far Cry 2: Fortunes Pack
Half-Life 2
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: Source
Half-Life Deathmatch: Source
Left 4 Dead
1 hrs on record
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Left 4 Dead Authoring Tools
Madballs in...Babo:Invasion
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Mass Effect
39 hrs on record
Osmos
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Plants vs. Zombies
95 hrs on record
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Portal
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Source SDK
Team Fortress 2
47 hrs on record
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World of Goo
3 hrs on record
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