(a.k.a. Big Steely.)
AFFILIATIONS: Koopa Troop.
CLOSE RELATIVES: None.
SKILLS AND ATTACKS: Rolling
STRENGTHS: Invincible and VERY heavy.
WEAKNESSES: Mario can easily avoid them.
BACKGROUND: These big black balls are thrown down by Bowser and King Bob-Omb to crush anyone who dares to challenge them! These iron spheres bounce down the path, in hopes of killing unsuspecting hikers. They also appear in a large metal cage where Goombas and windup springboards lurk.
They first appeared in Super Mario World where they were dark-grey coloured.
When Iron Balls returned in Super Mario 64 they were a darker black.