Melty Molten Galaxy

The Melty Molten Galaxy is a galaxy in Super Mario Galaxy. It's quite a large galaxy, made completely of lava and rock. There's many Star Rings here, allowing mario to traverse the massive planet.

Lava Planet
The Lava Planet is a Mega Planet in the upcoming game Super Mario Galaxy. It contains many obstacles and features relating to the Super Mario 64 level, Lethal Lava Land. Obviously, it is covered in a sea of lava. This level introduced trailer-viewers to a new enemy and new explorable uses for Spring Stars.

There is a small volcano on this planet with a Boost Star on top, there are outrageous obstacles over its atmosphere that can be explored with Float Stars, hot rock hills, decimatable rocks, stands in the lava such as the ones in Ricco Harbor in the game Super Mario Sunshine, and more.

The Sinking Lava Spire
Mario must travel the galaxy until he lands on a mountain, which begins to sink. Mario then must get to the top of the mountain quickly to gain the Power Star.

Through the Meteor Storm
In this mission, meteors are constantly falling from the sky. 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.

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.

Lava Spire Daredevil Run
This is the comet mission for Melty Molten Galaxy. Unlike most though, he doesn't fight a boss in this mission but must complete the entire "The Sinking Lava Spire" mission under the Daredevil Comet rules (1 life unit and no coins or Life Mushrooms).

Red-Hot Purple Coins
Mario must collect 100 Purple Coins on the main planet. There is no time limit.

Burning Tide
Mario must feed a Hungry Luma 80 star bits to get to a new planet where there are 5 Silver Stars he must collect. The islands on the planet are sinking and the player must stay in the higher areas until the lava level lowers and it's safe to walk to the next part.