Rainbow Islands Evolution is a game in the Bubble Bobble series for the PSP system. It is also known as New Rainbow Islands Hurdy Gurdy Daibouken in Japan. Bub and Bob, the two main characters in the series, are against an evil recording company that seeks to pollute the Rainbow Islands' atmosphere by creating constant musical noise, therefore wilting the flora and mutating the fauna. In this game, Bub and Bob use a hurdy gurdy (an old european musical instrument) as a weapon to create the rainbows.