Rainbow Islands Evolution

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.

Rainbow Islands Evolution is a game in the Bubble Bobble series.
The game follows the same vertical-scrolling system from the original, but it expands to a third dimension as there are platforms in the background which become accessible through the course of the game.