Thorn-Balls are a type of enemy which appear in Virtual Boy Wario Land. Thorn-Balls have the appearance of a bumblebee, but with their body in the shape of a vase. A Thorn-Ball spits out a spiked ball from the opening on top of its body, and if the spiked ball hits Wario, he takes damage. Thorn-Balls are in both the background and foreground of the level, meaning that Wario cannot attack a Thorn-Ball.