Big Steelies are large iron balls, usually black or gray in color. In most appearances, Big Steelies are indestructible, making them obstacles that have to be avoided.
Big Steelies only appear in the boss fight against Bowser. Here, after Bowser is hit twice, he begins to drop Big Steelies from his Koopa 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, so Mario or Luigi has to avoid each Big Steely and and wait for it to roll offscreen.
Big Steelies appear in Bob-omb Battlefield, Tall, Tall Mountain, and Tiny-Huge Island. Just like in Super Mario World, Big Steelies are indestructible. They roll down the hills from niches or from the sky before hitting a wall and shattering. Mario has to dodge any Big Steely that he encounters. The tiny variation of Tiny-Huge Island has smaller Big Steelies.
Aside from retaining their role from the original Super Mario 64, Big Steelies also had their role slightly expanded upon, due to the remake adding features not present in the original game. Big Steelies are also encountered in the Battle Fort, where they roll around the floor. It is now possible to destroy a Big Steely while under the effects of a Super Mushroom.
A Big Steely, generically referred to as a "rock," appears in the Jellyfish Sisters' tutorial on Dashing, in which Mario and Luigi have to push a rock. Some time later, Big Steelies pop up around Gwarhar Lagoon in timed courses involving the Dash.
Big Steelies, generically named "iron balls," appear in several locations. In Cavi Cape, Bowser must punch a falling Big Steely to knock it into a button. Sometime later, Midbus crushes Bowser with a massive Big Steely, prompting Mario and Luigi to stop by the Arm Center the last time.
Both games feature two Hammers called the Iron Ball Hammer and the Iron Ball Hammer DX, which sometimes causes an iron ball (as they are generically named in both games) to fall on a rival after performing a rating. In Mario & Luigi: Dream Team, Big Steelies have a studded appearance, but in Mario & Luigi: Paper Jam, they were given a smoother appearance.
Slip Slidin' Away • Lil' Penguin Lost • Big Penguin Race • Frosty Slide for 8 Red Coins • Snowman's Lost His Head • Wall Kicks Will Work (N64)/Mario's Super Wall Kick (DS) • Switch Star of Cool, Cool Mountain (DS)
Big Boo's Haunt
Go on a Ghost Hunt • Ride Big Boo's Merry Go Round • Secret of the Haunted Books • Seek the 8 Red Coins • Big Boo's Balcony • Eye to Eye in the Secret Room • Switch Star of the Basement
Hazy Maze Cave
Swimming Beast in the Cavern • Elevate for 8 Red Coins • Metal-Head Mario Can Move! (N64)/Metal-Head Wario Can Move (DS) • Navigating the Toxic Maze • A-Maze-Ing Emergency Exit • Watch for Rolling Rocks • Underground Switch Star
In the Talons of the Big Bird • Shining Atop the Pyramid • Inside the Ancient Pyramid • Stand Tall On the Four Pillars • Free Flying For 8 Red Coins (5th Star, N64) (7th Star, DS) • Tox Box Switch Star (DS) • Pyramid Puzzle
Snowman's Big Head • Chill with the Bully • In the Deep Freeze (N64) • Yoshi's Ice Sculpture (DS) • Whirl from the Freezing Pond • Shell Shreddin' for Red Coins (N64) • Snowman's Silver Star (DS) • Into the Igloo • Red Coins in the House (DS)
Wet-Dry World
Shocking Arrow Lifts! • Top o' the Town • Secrets in the Shallows and Sky (N64)/5 Secrets in the Shallows and Sky (DS) • Express Elevator--Hurry Up! • Go to Town for Red Coins (N64)/Go to Town for the Red Coins (DS) • Quick Race Through Downtown! • Soaked Silver Stars (DS)
Tall, Tall Mountain
Scale the Mountain • Mystery of the Monkey Cage • Scary 'Shrooms, Red Coins • Mysterious Mountainside • Breathtaking View from Bridge (Star 5, N64)/Breathtaking View from the Bridge (Star 7, DS) • Blast to the Lonely Mushroom (Star 6, N64) (Star 5, DS) • 5 Secrets of the Mountain
Roll into the Cage (N64) • Luigi in the Cage (DS) • The Pit and the Pendulums (N64) • The Pendulum Switch Star (DS) • Get a Hand • Stomp on the Thwomp •Timed Jumps on Moving Bars • Stop Time for Red Coins • Tick Tock Silver Stars
Rainbow Ride
Cruiser Crossing the Rainbow • The Big House in the Sky • Coins Amassed in a Maze • Swingin' in the Breeze • Tricky Triangles! • Somewhere over the Rainbow • Switch Star of the Manor
• ⋆-Enemy, boss, or stat exclusive to the main game. • ⋆⋆-Enemy, boss, or stat exclusive to Minion Quest: The Search for Bowser. • ⋆⋆⋆-Enemy variants differ in Mario & Luigi: Superstar Saga + Bowser's Minions.
Paper Bob-omb • Paper Boo • Paper Boomerang Bro • Paper Broozer • Paper Chain Chomp • Paper Dry Bones • Paper Fire Bro • Paper Fire Piranha Plant • Paper Fuzzy • Paper Goomba • Paper Hammer Bro • Paper Koopa Troopa • Paper Ninji • Paper Paragoomba • Paper Paratroopa • Paper Scaredy Rat • Paper Shy Guy • Paper Sombrero Guy • Paper Spear Guy • Paper Spike • Paper Spiny • Paper Swoop
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