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Elmo's 123s is a Sesame Street video games produced for the GameBoy Color in 1999 by Children's Television Workshop and NewKidCo. In this game, Elmo visits outer space where he could learn many different ways to use numbers for easy solving math problems. This game was developed to entertain and delight players while they master number recognition. It was also reissued in 2001 by UbiSoft and Sesame Workshop.