Sesame Street ABC was a game published by Hi-Tech for the Nintendo Entertainment System in 1986. This game was actually a package of two games in one: Letter-Go-Round and Ernie's Big Splash.
It was also released in 1988 for the home computer as Sesame Street's ABC & 123 - Four games in one which included both this game as well as the Sesame Street 123 game which had also been released separately.