Question: Which "30 Under 30" influential figures in the video game industry worked on  a cooperative first-person shooter video game with survival horror elements?
Sentence (from "Left 4 Dead"): Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region.
Relevant evidence: No