Rainbow World (レインボーワールド Reinbō Wārudo?), also referred to as Bubbleluna (バブルア Babarua?), Rainbow Land (レインボーランド Reinbō Rando?), Rainbow Star (レインボースター Reinbō Sutā?), and Motherland (マザーランド Mazārando?), is the home planet of Bub and Bob, and the main setting for most of the games in the Bubble Bobble series. Rainbow World is surrounded by numerous other planets, and is part of a large solar system that orbits the star Prominence.