Left 4 Dead 2
34.1 hrs last two weeks / 122.4 hrs on record
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Team Fortress 2
16.8 hrs last two weeks / 237.9 hrs on record
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Counter-Strike: Source
0.3 hrs on record
Day of Defeat: Source
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Garry's Mod
4.7 hrs on record
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Half-Life
3.2 hrs on record
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: Blue Shift
Half-Life: Opposing Force
Killing Floor
32.1 hrs on record
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Killing Floor Mod: Defence Alliance 2
Killing Floor SDK
Left 4 Dead
523.7 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
15.6 hrs on record
Left 4 Dead Authoring Tools
Portal
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Rainbow Six 3: Athena Sword
Rainbow Six 3: Gold
2.5 hrs on record
Source SDK
