Half-Life 2
12.8 hrs last two weeks / 74.9 hrs on record
Left 4 Dead 2 Authoring Tools
8.7 hrs last two weeks / 8.7 hrs on record
Half-Life 2: Episode One
7.5 hrs last two weeks / 7.5 hrs on record
Half-Life 2: Episode Two
5.8 hrs last two weeks / 7.9 hrs on record
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Counter-Strike: Source
2.3 hrs last two weeks / 15.1 hrs on record
Left 4 Dead 2
0.9 hrs last two weeks / 14 hrs on record
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Left 4 Dead
0.5 hrs last two weeks / 84.1 hrs on record
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Team Fortress 2
0.4 hrs last two weeks / 14 hrs on record
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Half-Life 2: Lost Coast
0.3 hrs last two weeks / 0.3 hrs on record
Source SDK
0.1 hrs last two weeks / 90.2 hrs on record
Day of Defeat: Source
1.2 hrs on record
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Garry's Mod
0.9 hrs on record
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Half-Life 2: Deathmatch
Half-Life: Source
1.5 hrs on record
Half-Life Deathmatch: Source
Left 4 Dead 2 Add-on Support
Left 4 Dead 2 Demo
8.1 hrs on record
Left 4 Dead Authoring Tools
33 hrs on record
Portal
1.2 hrs on record
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