Monstercise

According to the copyright message this game is part of the Children's Computer Worshop series (the Sesame Street series), but its part number CX-26131 and late copyright date 1984 are well outside the Children's Series range. Atari may have been planning some kind of series for young children and infants in order to reach as wide an audience as possible. There is evidence of this as prototypes for other children's games such as Peek-A-Boo and Honker Bonker fall into this part number range. This prototype even uses the Kid's Controller, which further supports this theory. In 1984 the videogame industry was crashing fast and Monstercise was probably scrapped due to lack of a market for such a game, or even possibly because of the gameplay was too similar to Grover's Music Maker (which was also not released). It's unknown if any more work was ever done on this title.