Borderlands
1.7 hrs last two weeks / 11.5 hrs on record
Audiosurf
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Commander Keen Complete Pack
Commandos: Behind Enemy Lines
Counter-Strike
Counter-Strike: Source
1.5 hrs on record
Day of Defeat
Deathmatch Classic
Defcon
Gish
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
Half-Life: Source
Half-Life Deathmatch: Source
Left 4 Dead
55.8 hrs on record
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Left 4 Dead Authoring Tools
Portal
1.7 hrs on record
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Ricochet
Sniper Elite
0.3 hrs on record
Source SDK
Team Fortress 2
4.4 hrs on record
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Team Fortress Classic
World of Goo
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