Elmo's 123s is a Sesame Street video game released in 1999 for the Game Boy Color. The game was developed by Bonsai Entertainment and published by NewKidCo, with Ubisoft Entertainment handling co-publication in Europe. It is the companion title to Elmo's ABCs.
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.