Big Steelies are large iron balls that appear in the final battle with Bowser in Super Mario World. They also appear in Super Mario 64 and Super Mario 64 DS as a common obstacle in various courses.


Big Steelies are first seen in Super Mario World. After Bowser is hit twice, he will start dropping Big Steelies from his Clown Car which roll around the arena as an additional obstacle for Mario (or Luigi) to avoid. Big Steelies are indestructible and cannot be destroyed, the only thing Mario (or Luigi) can do is avoid them and wait for them to roll offscreen.

A Big Steely as seen in Super Mario 64 DS.

A single Big Steely is seen in the Super Mario World TV Show in the episode Send in the Clown. King Koopa attempts to drop one down on Mario, Mario easily dodges the Big Steely.

Big Steelies later reappear in Super Mario 64. In this game, they are found in Bob-omb Battlefield, Tall, Tall Mountain, and Tiny-Huge Island. In this game, they are once again indestructible. They roll down the hills from niches or from the sky and try to hit Mario on their way down before running into the walls and shattering. Tiny-Huge Island also has smaller Big Steelies on the Tiny Island. In Super Mario 64 DS, Big Steelies are also seen in the game's new course The Secret Of Battle Fort where they roll around the floor of the course. In this game, they can be destroyed with the effects of the Mega Mushroom.

They are raise in Super Smash Bros. Melee in the Koopa Clown Car trophy, called "bowling balls".

A Big Steely (called a "rock") look during the Jellyfish Sisters' tutorial on Dashing, where it must be pushed with the ability. Sometime later, they pop up around Gwarhar Lagoon's outside in timed courses involving the Dash.

Big Steelies, called "iron balls," pop up in multiple locations. In Cavi Cape, Bowser must punch a falling one in order to knock it into a button (in the reboot, the Big Steely are restore with barrels). Sometime later, Midbus crushes Bowser with a massive one, prompting Mario and Luigi to stop by Arm Center the last time.

Big Steely is not in this game, however Hammers called the Iron Ball Hammer and the Iron Ball Hammer DX in two games, Mario & Luigi: Dream Team and Mario & Luigi: Paper Jam, which it causes an iron ball to fall an rival after an rating is perform sometimes. In the previous game, they have a studded appearance, though Hammers are smooth in the latter.