Thorn-Ball is an enemy found in the game Virtual Boy Wario Land. They are only encountered in Stage 13, within enclosed rooms in groups of two or three. Thorn-Balls are very similar in appearance to the generic bumblebee. Thorn-Balls continually eject spiked balls from the opening on the top of their head, which then falls and potentially harm Wario.
Thorn-Balls tend to reside in the foreground and background of the level, therefore they cannot touched by Wario. However, Wario is able to prevent harm from a single spiked ball by holding another enemy, such as a Mask-Guy, in between himself and the falling ball. This will cause both the picked-up enemy and the ball to disappear, but the Thorn-Ball will release another ball after a few seconds.
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