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The Intellivision is a video game console released by Mattel in 1979. Development of the console began in 1978 less than a year after the introduction of its main competitor the Atari 2600. The word intellivision is a portmanteau of intelligent television. Over 3 million Intellivision units were sold and a total of 125 games were released for the console.In 2009 video game website IGN named the Intellivision the No. 14 greatest video game console of all time.