Jackbox Games, Inc. (formerly Jellyvision Games, Inc.) is an American video game developer based in Chicago, Illinois, best known for the You Don't Know Jack (YDKJ) series of quiz-based party video games. Founded as a subsidiary of Jellyvision in 1995, the company was formerly incorporated as Jellyvision Games, until both companies formally separated in 2001. After seven years of dormancy, in 2008, Jellyvision Games was revived and rebranded Jackbox Games.

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