Team Fortress 2
22.7 hrs last two weeks / 945.9 hrs on record
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Left 4 Dead 2
2.1 hrs last two weeks / 2.1 hrs on record
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Counter-Strike
43.2 hrs on record
Counter-Strike: Source
Day of Defeat
Deathmatch Classic
Garry's Mod
1.3 hrs on record
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Half-Life
Half-Life 2
0.4 hrs on record
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
0.1 hrs on record
Left 4 Dead
29.7 hrs on record
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Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Authoring Tools
Left 4 Dead Authoring Tools
Portal
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Ricochet
Source SDK
