Boo's Boneyard Galaxy
From the Super Mario Wiki
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NOTE: Unless otherwise noted, all planet names are unofficial.
This planet is shaped like a giant skull and is surrounded by bones. If Mario spins on the eyes of the skull, he will get three Star Bits. There is a single pipe which takes Mario to the Spooky Speedster Planet. The background environment seen in this area is based upon that from Ghostly Galaxy.
Spooky Speedster planet
This planet is a large maze-like race course where Mario races the Spooky Speedster for the second time. Through the underground tunnels, there is a river of flowing ghosts, as well as so-called springs, fans, and many skeletons (after the finish line).
This galaxy contains only the following mission:
Names in other languages