Company: Valve

Prospero
Half-Life: Decay
Left 4 Dead
Team Fortress 2
Counter-Strike
Counter-Strike: Source
Portal
Half-Life: Blue Shift
Counter-Strike: Global Offensive
Half-Life 2
Half-Life 2: Episode One
New Trivia!
Garry's Mod
Half-Life
Half-Life
Half-Life: Opposing Force
Portal 2
Dota 2
Team Fortress Classic
Left 4 Dead 2
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Team Fortress, Day of Defeat, Counter-Strike and Ricochet were all originally fan-made mods.
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Development, General
person Zlew calendar_month September 24, 2013
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