The mushroom is a basic power-up in A Koopa's Revenge 2.
Accessible from the first level, the mushroom takes the place of the Shell from A Koopa's Revenge, restoring Koopa's shell if damage was taken and it was lost.
When being used, the mushroom will change Koopa's, Goomba's or Shy Guy's appearance to:
- give Koopa their shell.
- change Goomba back from a Galoomba.
- give Shy Guy back their mask.