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Valve Part 3: The Trouble with Sequels (1x19)

Air date: Nov 12, 2009

From Half-Life to Left 4 Dead 2, Valve has been one of the trailblazers in the video game industry. In this third episode of our retrospective, watch and see how Half-Life's popularity led to an incredibly rocky development cycle, fraught with a lawsuit and one of the biggest hacks in gaming history.