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Artwork of Megahammer from Super Mario Galaxy 2
Official artwork of Megahammer
Galaxy Bowser Jr.'s Fearsome Fleet
Mission(s) Bowser Jr's Mighty Megahammer
Megahammer's Daredevil Bash
World World 3
Star given Grand Star icon in Super Mario Galaxy 2.Prankster Comet icon in Super Mario Galaxy 2.
“Don't you know when to quit?! I'm gonna enjoy taking you out from the cozy confines of my robot cockpit! So you want a Grand Star, do ya? Well, come on, tough guy! Let's see if you're any match for Megahammer!”
Bowser Jr., Super Mario Galaxy 2

Megahammer is a boss found in the game Super Mario Galaxy 2 in Bowser Jr.'s Fearsome Fleet. It is a giant robot with large hammers for hands operated by Bowser Jr., and vaguely resembles a Koopa Clown Car. The head of the robot is actually Bowser Jr.'s robot cockpit, which attached to the body prior to the battle. Megahammer was originally going to be called Mallettoid, but this was changed in the final version of the game.[1]

Megahammer attacks by launching Bullet Bills and Banzai Bills. It also features a shockwave attack. To defeat it, the player must use Yoshi to catch the incoming Bullet Bills with his tongue, and spit them back at the robot's three blue orbs, two of which reside on its chest, while the last is found on its back. Players can use the Sling Star to get to the other side faster instead of walking around Megahammer. Once all three blue orbs have been destroyed, the metal plate covering the windshield of the robot cockpit head disappears. When Megahammer slams down its mallets, the player must use a Bullet Bill to hit Bowser Jr.'s cockpit. A successful hit will crack the glass. Another successful hit will shatter it, and the Megahammer will explode, causing Bowser Jr. to flee. The yellow and black designs on Megahammer's arena break off when attacked by Megahammer. If Megahammer's hammer or a Bullet Bill hits these designs, they fall off, creating a gap Mario or Luigi has to jump over. The yellow and black designs are unaffected by Megahammer's shockwaves because the shockwaves are in the air and not on the ground.

Megahammer is fought twice, with the second fight being under the Daredevil Comet conditions.

Later in the game, Megahammer can be seen in Bowser Jr.'s Boom Bunker, broken. The chimney on Megahammer's cockpit has fire coming out, and if Mario attempts to jump into the chimney, he is burned and receives damage. The Toad Brigade is seen when first in the galaxy, hiding behind an arm. However, Megahammer is shown to still be partially functional, as Bullet Bills will still shoot out of it, and its eyes blink from black to red.

In the Super Mario Mash-up in Minecraft, Iron Golems are reskinned to look like Megahammer.


Additional names[edit]

Internal names[edit]

Game File Name Meaning

Super Mario Galaxy 2 ObjectData/KoopaJrRobot.arc KoopaJrRobot Bowser Jr. Robot
Super Mario Galaxy 2 SystemData/ObjNameTable.arc/ObjNameTable.tbl クッパJrロボット (Kuppa Jr Robotto) Bowser Jr. Robot

Names in other languages[edit]

Language Name Meaning
Japanese メガハンマー

French Robomarto
Portmanteau of robot and marteau (Hammer)
German Pressluftpolterer
Compressed air-rumbler
Italian Megarobot Martellante
Giant Pounding Robot
Spanish (NOA) Martillator
Portmanteau of Martillo (Hammer) and Terminator


  1. ^ Nyugen, Thierry (February 24, 2010). Super Mario Galaxy 2 Makes Us Happy By Adding Drills And Yoshi. 1UP. Retrieved November 29, 2011 via Wayback Machine.