Team Fortress 2
75.7 hrs last two weeks / 552 hrs on record
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Left 4 Dead 2
1.1 hrs last two weeks / 46.5 hrs on record
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Counter-Strike: Source
0.5 hrs on record
Dawn of War: Dark Crusade
0.7 hrs on record
Dawn of War Gold
Dawn of War Gold: Winter Assault
Day of Defeat: Source
0.8 hrs on record
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Fallout 3
Fallout Tactics
Half-Life 2
9 hrs on record
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Episode Two
1.8 hrs on record
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Half-Life 2: Lost Coast
Left 4 Dead
14.4 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead 2 Demo
10.6 hrs on record
Left 4 Dead Authoring Tools
Portal
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Saint's Row 2
Source SDK
World of Goo
8.5 hrs on record
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