From the exterior, the 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.
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