Puzzle Bobble 4 (also known as Bust-A-Move 4 for the North American and European console versions) is the third sequel to the video game Puzzle Bobble and is the final appearance of the series on the PlayStation and the only appearance of the series on the Dreamcast. On the planet Bubbleluna lives the twins Bub and Bob. One day the sun fails to rise because the Fairy of the Night Cleon has stolen the light source known as the Rainbow for Full-Moon Madame Luna. She splits this rainbow into 7 light bubbles. Bub and Bob then set off to retrieve these bubbles and restore the light and peace to their planet.