Team Fortress 2
37.3 hrs last two weeks / 344.4 hrs on record
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Aion Collectors Edition
Commander Keen Complete Pack
Counter-Strike
0.9 hrs on record
Counter-Strike: Source
Day of Defeat
0.2 hrs on record
Deathmatch Classic
Doom 2
Doom 3
Doom 3: Resurrection of Evil
Final Doom
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
Heretic: Shadow of the Serpent Riders
Hexen
Hexen 2
Hexen: Deathkings of the Dark Citadel
Left 4 Dead
10.7 hrs on record
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Left 4 Dead Authoring Tools
Master Levels of Doom II
Portal
0.6 hrs on record
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Quake
Quake 3 Arena
6.5 hrs on record
Quake 3 Team Arena
Quake II
Quake II: Ground Zero
Quake II: The Reckoning
Quake Mission Pack 1: Scourge of Armagon
Quake Mission Pack 2: Dissolution of Eternity
Return to Castle Wolfenstein
Ricochet
Source SDK
Spear of Destiny
Team Fortress Classic
0.8 hrs on record
Ultimate Doom
