Super Starter Galaxy

The Super Starter Galaxy is the 1st Galaxy in Super Mario Galaxy 3. It is a galaxy where you learn how to play the game. There are three missions and two bosses

Starting Planet (1,2,3)
The Starting Planet is a small green planet and the location of where all three missions start. This is where you meet a luma who guides you through your first level.

Goomba Planet (1)
On this planet, there are six goombas, one of which has a key, you need to stomp on the goombas and get the key to get a sling star to the next planet.

Moving Platform Planet (1)
This planet has a series of moving platforms which you need to cross to reach the slingstar.

Hydra Piranha's Planet (1)
At the end of the first mission, you fall into Hydra Piranha's planet, who is fought almost identically to Dino Piranha from the first game, but it has six heads, and each time you launch it's tail into it's face, it loses a head. Defeat him here and you get the first star

Disappearing Planet (2,3)
The Disappearing planet has a long twisting path of platforms that will appear once you groundpound on a switch. You then have a short period of time to reach the end of this platform to get to a safe point. Immediately afterwards, there is another disappearing puzzle where Mario has to make it across platforms that disappear if he stays on them for too long. Once he reaches the end of this one, you can take the slingstar to the next planet.

Big Goomba Planet (2,3)
This planet is a much bigger version of the Goomba planet from the first mission. This is a large round planet with 8 small goombas and 6 giant goombas, one of these has the key to reach the next planet.