Melty Molten Galaxy is a galaxy found in Super Mario Galaxy. This galaxy is the final "main" galaxy in the game, and the final galaxy to be orbited by a Daredevil and Purple Comet. As the name implies, this galaxy mostly focuses on lava.
- The Sinking Lava Spire
- Through the Meteor Storm
- Fiery Dino Piranha
- Lava Spire Daredevil Run
- Red-Hot Purple Coins
- Burning Tide
- This is the only "main" galaxy to have Star Ball Rolling.
- In Super Mario Galaxy 2, when leaving the first planet of the Yoshi Star Galaxy, the volcano in the background erupts, similar to how the volcano in this galaxy works.
- This is the only galaxy to have a Daredevil comet involving clearing a whole mission (all other galaxies orbited by Daredevil comets involve defeating a boss).
- Gobblegut and his counterpart Fire Gobblegut from Super Mario Galaxy 2 work in a similar manner to Dino Piranha and Fiery Dino Piranha, because both the normal versions of these bosses are fought in World 1, while the fiery versions of these bosses are fought in World 6.
- The fact the player can fall down into the volcano marks the third time the player can enter a volcano, the first being Super Mario 64 (Lethal Lava Land) and the second one being Super Mario Sunshine (Corona Mountain). Even more interesting, all of these games were the player can enter a volcano are 3D Mario platformers.
- If the player falls into the volcano, they can ground pound on a switch to make Star Bits appear. But in the Purple Coin Mission of this galaxy, the switch is missing, most likely because 5 purple coins exist in there.
- This is one of the few galaxies in which the Power Star for the Purple Coin Missing is placed in another location rather than the start. The other ones to have this feature are Battlerock Galaxy, Ghostly Galaxy, Dusty Dunes Galaxy, Gold Leaf Galaxy, Deep Dark Galaxy, and Dreadnought Galaxy. For this one, the Power Star is located at the highest platform near the first Sling Star.
- This galaxy has the highest amount of Star Bits needed to access the hidden star: 80. Interestingly, this is the only galaxy that needs 80 Star Bits to access the hidden star.
- For some unknown reason, if the player uses the first Pull Star in the first mission, the player can't get the gravity to pull him/her back to the three ball-shaped planets: the gravity instead pulls them to a lava planet.
- The Melty Monster Galaxy from Super Mario Galaxy 2 seems to be based off this galaxy, because both of them involve lava.
- This galaxy seems to be based off Lethal Lava Land from Super Mario 64.
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