Matter Splatter Galaxy

Matter Splatter Galaxy is a galaxy from Super Mario Galaxy. Unusually, the galaxy's surfaces appears when a sort of spotlight moves across them, and disappears when the spotlight moves away, making the level rather tricky. Magikoopas are the only enemies in this level.

Watch your Step
Mario lands on a solid platform. He then has to pass the planet until he reaches a green Warp Pipe. He will end up on a planet that requires a few Wall Jumps to get to the top and into the next planet. Mario will have to jump up pink platforms and destroy the crystal to get a spring mushroom. He has to bounce up to grab the Question Coin to move the "spotlight". Once he reaches the top, he must use the Sling Star to transform back into normal and land on another planet. Mario must then travel through a maze, so if he reaches a dead end, he will fall. In every group of four Star Bits, a Magikoopa will appear. Once he passes, the "spotlight" will begin to shrink, so he has to get the Power Star very quickly.

Trivia

 * The secret level in the Ghostly Galaxy uses the same concept as this level, though is much shorter and entirely 3D.
 * Matter is the substance that makes up everything in the known universe.