Astro-Grover is a Sesame Street game for home computers developed by Hi Tech Expressions and Children's Television Workshop and released in 1987. The game teaches counting, adding and subtracting for one player. The game was also developed in a version that would work with the Muppet Learning Keys.
Children help GROVER count the Zips and if they are right, GROVER will fly out to meet them. In case of a wrong answer, the Man-in-the-Moon will shake his head and encourage the child to try again. As children develop their number skills, a series of correct answers results in the building of GROVER's beautiful city or the launching of a zippy spaceship.
Grover has also visited the Moon on several other occasions, including The Sesame Street 1976 Calendar and The Sesame Street Dictionary; he also jumps over the moon in his imagination in Happy Healthy Monsters.