Team Fortress 2
45.2 hrs last two weeks / 275 hrs on record
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Left 4 Dead 2
1.7 hrs last two weeks / 51.5 hrs on record
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Condition Zero
Condition Zero Deleted Scenes
Counter-Strike
Counter-Strike: Source
Darkest Hour
Day of Defeat
Day of Defeat: Source
14.4 hrs on record
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Deathmatch Classic
Garry's Mod
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Half-Life
0.1 hrs on record
Half-Life 2
28.9 hrs on record
Half-Life 2: Deathmatch
Half-Life 2: Episode One
Half-Life 2: Episode Two
2.8 hrs on record
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Half-Life 2: Lost Coast
Half-Life: Blue Shift
Half-Life: Opposing Force
Half-Life: Source
Half-Life Deathmatch: Source
Killing Floor
3 hrs on record
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Killing Floor Mod: Defence Alliance 2
Killing Floor SDK
Left 4 Dead
146.5 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
2.6 hrs on record
Left 4 Dead Authoring Tools
161.7 hrs on record
Mare Nostrum
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Mare Nostrum Dedicated Server
Portal
15.8 hrs on record
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Red Orchestra
0.3 hrs on record
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Ricochet
Source SDK
11.1 hrs on record
