Buoy Base Galaxy

The Buoy Base Galaxy is a galaxy that appears in Super Mario Galaxy. The galaxy contains a large fortress floating atop a large, spherical pool of water. Mario has to climb this fortress in order to get the main Power Star in this galaxy.

The Floating Fortress
In The Floating Fortress, the objective is to scale the fortress and receive the Power Star, located on a planetoid above the fortress. In order to do this, the player must first enter the pool of water and release the weight from within by directing the attacking Torpedo Teds towards the weight. Then Mario must begin his ascent, surviving the various traps that have been put in place to stop him, collecting the five blue star chips, to eventually lay out a path of Pull Stars towards the next planet. There, Mario has to head to the top of the planet, where it is opened by spinning on a gold screw.Then Mario/Luigi must dives in to retrieve the Power Star.

Secret of Buoy Base
This time, when Mario dives into the surrounding pool of water, he must seek out a caged green pipe, and open it by luring the Torpedo Teds into it. The pipe takes Mario to the outside of the planet, where Mario must lure Bullet Bills into a cage that contains the Green Power Star.

Enemies

 * Goombas
 * Torpedo Teds
 * Electrogoombas
 * Bloopers
 * Thwomps
 * Amps
 * Topmen
 * Bullet Bills
 * Astro Goombas

Trivia

 * The sphere containing the Power Star that hangs above the Buoy Base resembles a Poké Ball and opens like one too.
 * This is the only galaxy outside of the 15 main galaxies and the Gateway Galaxy to contain multiple Power Stars.