Boomsday Machine

Artwork of the Boomsday Machine from Super Mario Galaxy 2

“My dad's gonna get angry if I let you get another ... Time to break out my Boomsday Machine! I'll just relax in my comfy cockpit and watch you go BOOM!”

—Bowser Jr., Super Mario Galaxy 2

The Boomsday Machine is a castle-like tank invented by Bowser Jr. that appears in Super Mario Galaxy 2. The first part of its name is a portmanteau of the onomatopoeia "boom" and the word "doomsday." The machine has three Fire Bars circling around it, and the top section has a spinning turret mechanism. The machine is fought in the galaxy Bowser Jr.'s Boom Bunker. The music heard during this battle is the same as in the Bowser Jr.'s Airship Armada battle.

Cloud Mario, fighting the Boomsday Machine

There are ample Cloud Flowers around the area to grab. The player must use Cloud Mario's ability to ascend the battlefield and get to the top of the Boomsday Machine. For the first round, the player must run for one of the updrafts and then spin to create a cloud and ride it upwards. From there, Mario can traverse across the various clouds scattered throughout the battlefield, using his cloud-making ability to assist himself. Once the player reaches the top of the tower, they must damage the machine by ground-pounding the glass. If Mario stands on the glass cockpit for too long, Bowser Jr. will spin his launcher to knock Mario off.

The second round is much like the first, but now the tower attempts to vacuum the area, pulling the clouds out from under the player's feet. The player should still be able to just long-jump to the top of the tower in the same manner. The player also needs to watch out for an electric shield that covers Bowser Jr.'s dome periodically when he is sucking up clouds.

Cloud Mario, fighting the final form of the Boomsday Machine

In the final round, the tower goes mobile. This makes the player's climb to the top more difficult, since Bowser Jr.'s cockpit is much higher up. The player still needs to avoid coming in contact with the yellow projectiles, the spinning fire wheel, and the vacuum attack. The fire on the Boomsday Machine also destroys the player's clouds. Once the player reaches the top of an updraft, they need to use the Cloud Flower refill to get to an even higher cloud tier. They should use long jumps to get to the distant cloud, and they can score another refill. From there, the player can reach the dome with their cloud platform recharge. Once the player arrives at the glass dome, they must ground-pound it a third time, which destroys the machine and reveals the Grand Star.

Mario faces this boss twice, with the second match being under a Daredevil Comet's conditions.

Statistics

Boomsday Machine
	World	World 5	Galaxy	Bowser Jr.'s Boom Bunker
	Mission	Bowser Jr.'s Boomsday Machine Boomsday Machine Daredevil Run	Reward

Additional names

Internal names

Game	File	Name	Meaning
Super Mario Galaxy 2	ObjectData/KoopaJrCastle.arc	KoopaJrCastle	Bowser Jr. Castle
Super Mario Galaxy 2	SystemData/ObjNameTable.arc/ObjNameTable.tbl	クッパJrキャッスル (Kuppa Jr Kyassuru)	Bowser Jr. Castle

Names in other languages

Language	Name	Meaning	Notes
Japanese	バトルキャッスル[?] Batoru Kyassuru	Battle Castle
French (NOE)	Tank Cataboum[?]	Cataboum Tank; Cataboum is portmanteau of "catastrophe" and the onomatopoeia "boum"
German	Megamurks-Maschine[?]	Mega butch-Machine
Italian	Torrattacco[?]	Attack Tower
Korean	배틀캐슬[?] Baeteul-kaeseul	Battle Castle
Spanish	Tanquetorreta[?]	Tankturret