Jackbox Games (formerly Jellyvision Games) is a Chicago-based video game developer, known for the You Don't Know Jack series (YDKJ) of trivia quiz-based video games. The company was previously incorporated as Jellyvision Inc. until the formal separation of the games development unit from interactive video advertising division, Jellyvision Labs. The company was reincorporated as Jellyvision Games, Inc. in December 2011, and rebranded as Jackbox Games in June 2013. More: en.wikipedia.org.