Left 4 Dead 2
31.5 hrs last two weeks / 99 hrs on record
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Team Fortress 2
7.6 hrs last two weeks / 139.5 hrs on record
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Left 4 Dead
6.2 hrs last two weeks / 424.5 hrs on record
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Aion
Counter-Strike: Source
Day of Defeat: Source
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Fallout 3
41.8 hrs on record
Half-Life
0.1 hrs on record
Half-Life 2
8.6 hrs on record
Half-Life 2: Deathmatch
0.6 hrs on record
Half-Life 2: Episode One
2.9 hrs on record
Half-Life 2: Episode Two
5.3 hrs on record
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Half-Life 2: Lost Coast
Left 4 Dead 2 Demo
1.7 hrs on record
Left 4 Dead Authoring Tools
Osmos
0.2 hrs on record
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Penumbra: Black Plague
Penumbra: Overture
0.2 hrs on record
Penumbra: Requiem
Portal
1.4 hrs on record
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Source SDK
STALKER: Shadow of Chernobyl
Starwars: Knights of The Old Republic
0.2 hrs on record
World of Goo
2.6 hrs on record
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