Valve Corporation, also known as Valve Software, is an American video game developer, publisher, and digital distribution company headquartered in Bellevue, Washington. It is the developer of the software distribution platform Steam and the franchises Half-Life, Counter-Strike, Portal, Day of Defeat, Team Fortress, Left 4 Dead, and Dota. Valve was founded in 1996 by former Microsoft employees Gabe Newell and Mike Harrington. Their debut game, the first-person shooter (FPS) Half-Life (1998), was a critical and commercial success; with its realism, scripted sequences and seamless narrative, it had a lasting influence on the FPS genre. Harrington left in 2000. In 2003, Valve launched Steam, followed by Half-Life 2 in 2004. With advanced physics systems and an increased focus on story and characters, Half-Life 2 received critical acclaim and sold 12 million copies by 2011. In 2006, Valve released the episodic sequel Half-Life 2: Episode One, followed in 2007 by Episode Two, the multiplayer game Team Fortress 2 and the puzzle game Portal. Portal 2 was released in 2011. In 2013, Valve released the multiplayer online battle arena game Dota 2. More information...
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