World of Goo
4.2 hrs last two weeks / 9.6 hrs on record
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Assassin's Creed
1.2 hrs on record
Batman: Arkham Asylum
0.9 hrs on record
Batman: Arkham Asylum - License Revoking Tool
Bioshock
Borderlands
4.5 hrs on record
Call of Duty: World at War
7 hrs on record
Counter-Strike
4 hrs on record
Counter-Strike: Source
22.1 hrs on record
Day of Defeat
Deathmatch Classic
Half-Life
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
Hitman 2: Silent Assassin
19.3 hrs on record
Hitman: Blood Money
Hitman: Codename 47
Left 4 Dead
11.8 hrs on record
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Left 4 Dead Authoring Tools
Operation Flashpoint: Dragon Rising
22.7 hrs on record
Operation Flashpoint: Dragon Rising Mission Editor
Plants vs. Zombies
29.2 hrs on record
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Portal
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Ricochet
Source SDK
Team Fortress 2
8.1 hrs on record
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Team Fortress Classic
Unreal Tournament 3 Black
0.7 hrs on record
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