Goop ball

A goop ball is an object that can be used as a weapon or to solve puzzles by throwing it from a distance.

=In fanon games=

In Pikmin Adventure (DrTapeworm version)
Goop balls are items in Pikmin Adventure. They can be many things: balls of sludge, hardened lava, or rocks. Blue will pick up one he is near if the attack button is pressed, and pressing the button again will make him throw it in the direction he is currently facing. They deal damage to enemies when thrown and can activate switches as well.