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Valve Part 6: Beyond the Crowbar... And Beyond (1x22)

Air date: Nov 23, 2009

From Half-Life to Left 4 Dead 2, Valve has been one of the trailblazers of the video game industry. In this sixth and final episode of our retrospective, watch how Valve finally left their Half-Life franchise behind to pursue a brand-new IP, Left 4 Dead, and then created amazement and controversy with its swift follow-up, Left 4 Dead 2.