This article is about the dome in Super Mario Galaxy. For the board from Mario Party also known as simply "Engine Room", see Luigi's Engine Room. For the room in Super Mario Galaxy 2, see Starship Mario § Engine Room.

Engine Room
Screenshot of the Engine Room's exterior
Games	Super Mario Galaxy Super Mario 3D All-Stars
Number of levels	6 (inc. Hungry Luma galaxy)
World progression ← Previous Bedroom Next → Garden Super Mario Galaxy domes

“It might get a little rough from here on out, but just do your best and you'll be OK!”

—Gearmo, Super Mario Galaxy

The Engine Room is a dome in Super Mario Galaxy and its Nintendo Switch port. It is the fifth accessible dome on the Comet Observatory, and will be unlocked whenever Mario or Luigi recovers the Grand Star from Bowser's Dark Matter Plant.

The outside of Engine Room looks simply like a large metal dome, while inside there are purple and blue pipes leading up from a steel mesh floor. A Gearmo patrols the room, although he serves no real significance. As with all domes, the Engine Room has a Pull Star in the center, which is used to access the dome's Galaxies. Mario does not need to enter the Engine Room in order to reach Bowser's Galaxy Reactor, as he can just collect the sixty Power Stars required to access it from previous galaxies.

The main boss of the Engine Room is a more powerful version of King Kaliente.

Galaxies

Inside the Engine Room.

The Engine Room galaxies.

Galaxy	Description	Number of Star(s)	Unlocking criterion
Gold Leaf Galaxy	This Galaxy is essentially a mirror of the Honeyhive Galaxy, set in autumn and with minor changes. Bees, Star Bunnies, and Cataquacks can be found here, as well as the Undergrunt Gunner boss.		Collect 34 Stars and finish Bowser's Dark Matter Plant.
Sea Slide Galaxy	This is a beach-themed Galaxy that consists of a ring of water encircling an oblong central planet. It is inhabited by penguins and the orca whale Guppy.		Collect 36 Stars.
Toy Time Galaxy	This playroom-themed Galaxy has many colorful planets and gigantic toys, as well as sweets, as shown in its third mission. Gearmos can be found here.		Collect 40 Stars.
Bonefin Galaxy	This Galaxy consists of one planet that is a sphere of water surrounded by a black shell. It is home to Kingfin, a skeletal shark that is the Galaxy's boss.		Collect 55 stars and finish Giant Eel Outbreak.
Bowser Jr.'s Lava Reactor	The Engine Room's boss battle takes place in this Galaxy. It contains a large planet made of lava, in which lives King Kaliente (summoned by Bowser Jr.), who the player must battle a second time.		Collect 45 Stars.
Sand Spiral Galaxy	This Hungry Luma Galaxy features a large tube-shaped planet full of flowing quicksand, which the player must choose either the Bee Mushroom or the Boo Mushroom to traverse. Behind it is a small, bright moon with platforms revolving swiftly around it.		Complete Faster Than a Speeding Penguin, Luigi and the Haunted Mansion, and then feed the Hungry Luma 1000 Star Bits.

Names in other languages

Notes

• The Engine Room is the only dome in the game where an NPC other than Polari can be spoken to.
• It is possible to gain access to the exterior of the Engine Room before completing Bowser's Dark Matter Plant by using the slope-climbing glitch on the sloped roof of the Comet Observatory. As a result, the Warp Pad on the upper floor that connects to the Warp Pad next to the couch on the lower floor can be activated even before the Engine Room has been unlocked, allowing permanent access to the upper floor.

References

• Cosmic areas
• Mechanical areas
• Super Mario Galaxy locations

• Articles with unsourced Portuguese names