www.youtube.com Click the above link to watch the previous episode! Valve Software Ep. 4: All Your History S1E19 (Game Development History) From Half-Life to Left 4 Dead 2, Valve has been one of the trailblazers of the video game industry. In this fourth episode of our retrospective, watch and see how Valve’s long-delayed Half-Life 2 is finally unleashed onto the world next to Steam, its digital distribution service. Both were incredible gambles for the independent company — both of which …