Rainbow Fish and the Amazing Lagoon is an interactive story based on characters created by the children's book author and illustrator, Marcus Pfister, for his picture book about the colorful fish, and on the television series stemming from the book. An interactive underwater adventure where you can talk and play games with sea creatures.

In this game, Rainbow Fish's friend Molo is very sick; covered with spots and sleeping all the time. Rainbow Fish must talk to everyone who lives in the Amazing Lagoon, solve their problems, find a magic cauldron and assemble potion ingredients in order to cure him.