Melty Molten Galaxy
The Melty Molten Galaxy is a galaxy in Super Mario Galaxy, and the last major galaxy to be unlocked in a dome. It is quite a large galaxy, made completely of lava and rock. It is situated between two stars, a red one and a light purple one. There are many Launch Stars here, allowing Mario to traverse the massive planet. There are also some small planetoids around it.
Starting Planet or Lava Planet
This area is a large disk of lava connected to the main planet. It contains a small volcano called Mt. Molten with two large platforms on either side of it. Both have various obstacles and enemies. Small steel platforms make a path between the two platforms. The volcano has a switch inside that makes the lava rise and release Star Bits.
The Volcano Area is a volcano area found in the Melty Molten Galaxy. There is a Launch Star above it, but if Mario drops into the volcano, there is a ground-pound switch on a rock floor at the bottom, which causes star bits to appear. However, the volcano will erupt fifteen seconds after Mario activates the switch, so they have to use a Sling Star at the bottom to get out. In the Purple Coin mission (Red Hot Purple Coins), there are purple coins down the sides of and inside of the Volcano Area. One coin in this mission is placed on top of a small lava ring inside the volcano, requiring two health slices to reach it, unless the player uses a good timed spin or a Long Jump.
Small Glass and Lava Planets
These are a collection of six small lava planets and three small glass planets. Mario must navigate his way through these planets via Pull Stars avoiding solar arcs that will knock him off the Pull Star path and take him into their gravity fields causing Mario to bounce across the lava surface. In the Daredevil Run, Mario needs to wait for these arcs to pass or he will be hit and lose a life.
Hardening Lava Planets
These are two hardening planets made of magma and cooled lava. They are home to several Li'l Cinders. Beside them lies a crashed saucer that serves as a starting platform. Strangely, these planets have their own gravity even though they are embedded in the main planet's surface.
The Formation Planets are a large rock formation surrounded by other large rock formations that are intertwined. The spire is also home to many Burn Bits. On top of the spire, a Power Star is incased in a large ice crystal that Mario must get to. When when Mario steps on the spire, it begins to sink and now he must run up the spire or be engulfed by the lava. There is a shortcut at the beginning of the spire that leads Mario halfway up and gets him a 1-Up Mushroom.
This planet is a large stone octagon that is covered by three Thwomps, which has a 1-Up Mushroom under the third Thwomp. The core of this planet is a black hole that Mario must avoid.
U Tower Planet
This planet is a large U-shaped planet of cooled magma with stone built onto it to make it like a tower from a castle. The inside of the planet is made out of hot magma. On one side of the planet, there is a Launch Star that leads to the next planet. On the other side of the planet, there is a double-sided Bullet Bill Blaster that will try to stop Mario from continuing.
Cooled Lava Area
Lava Ball Game Area
This area is made up of many lava panels, four stone panels, and a humoungus tunnel of lava. The tunnel has many holes in it that Mario can fall through to his death. Mario must roll on the Rolling Ball to the finish line so he could receive the Power Star. There is a shortcut Mario can take to avoid the moving lava platforms: he can jump to the stone platform with a 1-Up Mushroom. Jumping on this platform will cause the ball to slow down, so the player must roll the ball near the back edge of the platform, build up momentum, and jump. It saves the time of going over the moving lava platforms.
Steel Platform Area
This is a small area with many steel platforms and sling stars. Mario must use the Sling Stars to avoid falling into the lava and dodge the lava spouts. At the end of this area, there is Lumalee that Mario could decide to buy either a 1-Up Mushroom or a Life Mushroom for the battle against Fiery Dino Piranha.
Fiery Dino Piranha Planet
This planet is the home to Fiery Dino Piranha. Mario first arrives to the planet as he lands on Fiery Dino Piranha egg and cracks it, which made a slight crack on the egg. After Mario pulling the tail, the Fiery Dino Piranha breaks out of it's egg and tries to attack Mario. Mario is rewarded with a Power Star after he defeats Fiery Dino Piranha.
Lava Sea Planet
This is a small rock planet with a sea of lava around it, created by feeding a Hungry Luma. The lava has a tide that the low tide reveal a network of paths, which Mario could advance through, and lava would cover up the path when it is a high tide. Mario must scuttle across the planet, avoiding high tides and Burn Bits to retrieve five Silver Stars and get the Power Star.
The Sinking Lava Spire
Mario starts out in the fire cauldron area, which he has to cross completely and get to the Launch Star at the top of the volcano. Mario can let himself fall into the volcano at this point, where he can get many Star Bits. As Mario leaves the volcano, it erupts. On little sphere capsules in the sky over the lava planet Mario meets a Hungry Luma. He has to use Pull Stars to get around miniature suns on his way through the sky. He then returns to the planet and has to search Star Chips to get to the Lava Spire, a mountain which begins to sink. Mario then must get to the top of the mountain quickly and smash the crystal to gain the Power Star.
Through the Meteor Storm
In this mission, Meteors are constantly falling from the sky. Mario must constantly avoid them or they will burn Mario. Near the end of the mission, a part similar to Rolling Green Galaxy must be completed where Mario must ride a Star Ball to the end of a lava covered course without falling through the holes in the tunnel. Once Mario is at the end of the course, the Star Ball will break, giving Mario the Power Star.
Fiery Dino Piranha
In this level, Mario must battle a fiery version of the first boss, Dino Piranha. The fiery version is faster, and Mario is only able to hit its tail when it is not on fire, which gets increasingly difficult because the flame goes out quicker and makes a flaming trail after a couple of hits.
Lava Spire Daredevil Run (Daredevil Comet)
This is the Daredevil comet mission for Melty Molten Galaxy. Unlike most though, Mario does not fight a boss in this mission but must complete the entire "The Sinking Lava Spire" mission with only one bar of health.
Red-Hot Purple Coins (Purple Comet)
Just like any other Purple Comet mission, Mario must collect all 100 Purple Coins on the main planet. There is no time limit.
Mario must feed a Hungry Luma eighty Star Bits to create a new planet where there are five Silver Stars he must collect. The only sections of land on the planet are constantly being submerged by searing lava, and the player must therefore make sure to stay in the higher areas until the lava level lowers and it's safe to walk to the next part. The white areas are always safe. Once Mario has gotten all five Silver Stars, the resulting Power Star will appear on a lower area of the ground, so Mario must wait until it is safe to grab the Star.
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