- This article is about the Bullet Bill-like enemies in Kirby: Planet Robobot, and should not be confused with iron Boulders.
Iron Ball[from internal data] is an enemy that debuted in Kirby: Planet Robobot. It serves as a stage hazard, rotating about a fixed point in various places. It can only be destroyed using the Robobot Armor.
Iron ball is a golden bullet-shaped battering ram attached to a pivot. It spins about this axis in place in various stages, moving in and out of the area where Kirby can occupy. If it hits Kirby, it will either send him flying off into the distance, or splat him against the screen, depending on which way it hits him from. It is invulnerable to any of Kirby's attacks on his own, but can be destroyed with any attack from the Robobot Armor.
- Iron Ball somewhat resembles a Bullet Bill from the Mario series.