Shell (flashing)



A Rainbow Shell is a kind of shell found only in Super Mario World. If a yellow Beach Koopa climbs into a Shell of any colour, including its own after being ejected from it, it becomes invincible, with its shell flashing rainbow colours (turning it into a Rainbow Shell). After its transformation, the yellow Koopa attempts to hit Mario or Luigi by spinning around in its shell and dashing towards them.

Jumping on a Rainbow Shell causes the Mario Bros. to bounce upwards, but does not damage the shell. Yellow Koopas wearing a Rainbow Shell can only be defeated with a Yoshi, a Spin Jump or a Star. If any Yoshi eats a Rainbow Shell, it obtains all three shell abilities (causing small earthquakes, flying and spitting out fire) as long as the shell remains in its mouth.