Rolling Coaster Galaxy

The Rolling Coaster Galaxy is one of the many galaxies found in Super Mario Galaxy 2. Like its name implies, this galaxy is like a roller coaster and, like in Rolling Masterpiece Galaxy, the player must roll a Star Ball to the end. Also, many Starshrooms appear along the way. It seems to be a reference to the Rainbow Road courses in the Mario Kart series. The name of the first mission in this galaxy confirms this.

A bit in the stage, the path splits to two. One of the Toads says that the right path is for experts. On the purple coins mission, the path for experts is the only path found. The only enemies found in this galaxy are Bob-ombs and Goombas.

Rainbow Road Planet
Not counting the Starshrooms, this is the only planet found in this galaxy. The Rainbow Road planet is a big roller coaster that the player needs to use to break the Star Ball or the Purple Coin Ball. Just like it's name implies, it's rainbow-colored and have are some wooden parts on it. There are also some rails. Only Bob-ombs and Goombas can be encountered on this planet. A Gearmo also lives on this planet.

Enemies

 * Bob-ombs
 * Goombas

The Rainbow Road Roll
To complete this mission, the player first needs to get the Star Ball at the entrance. Then, he has to use it to roll on the Rainbow Road. He must avoid falling or running into Bob-ombs. When he makes it at the end of the roller coaster, he'll find a green hole. He must put the Star Ball there to release the Power Star.


 * Enemies
 * Bob-ombs
 * Goombas
 * Planets Visited
 * Rainbow Road Planet

Purple Coins on the Rainbow Road
When the Prankster Comet has been unlocked, the player will find a Purple Coin Ball. He has to do the same thing as the first mission except he has to make sure he gets almost all of the Purple Coins found on the Roller Coaster Planet. There is a total of 110. If he collects them all within the time limit, including the one in the ball, and makes it to the end of this planet, a Gearmo will reward him with a Power Star.


 * Enemies
 * None
 * Planets Visited
 * Rainbow Road Planet

Green Star 1
The first Green Star is located near the beginning of the Rainbow Road Planet. Taking the regular way and not the expert way, stay in the middle of the course. Help Mario do his best to stay in the middle and avoid Bob-ombs and Goombas. If done correctly, the player should have Mario rolling up a bumpy slope. Just before Mario drops off the end of the slope, use the momentum of the ride and jump into the air directly onto the star.

Green Star 2
The last Green Star is near the end of the Rainbow Road Planet, just before the bottom. It will appear at the right side of the course, hovering above midair. In order for Mario to reach it, the player must either carefully use the momentum of the course to land onto the star or to jump before reaching the edge. If done correctly, Mario should easily grab the star instead of falling off the course.

Trivia

 * The galaxy has Super Mario 64's The Princess's Secret Slide stage music.
 * The levels include the phrase Rainbow Road which is the name of many different races in the Mario Kart series.