Coiley (Japanese: ばねぼう Banebou) is a springlike, mushroom-shaped enemy which can only move by making short jumps, having a single powerful spring instead of legs. Coileys bounce around the level. It makes its first appearance at stage 30, and is the only enemy who stays the same in Super Mode (it is not swapped with any other enemy). Coiley also appears in the Bust-A-Move series in the form of the orange bubble and in some games as a playable character.

In Europe, they are known as Bonnie-Bo.