The Grandmaster Galaxy is the final galaxy of Super Mario Galaxy 2. It is located in World S. This galaxy is unlocked when the player has collected all 240 Stars, much like the Grand Finale Galaxy from Super Mario Galaxy. This galaxy contains two Power Stars: one for completing the level and another one for a second completion under Daredevil Comet conditions. In the latter case, the player gets the Star from Rosalina. Unlike the rest of the galaxies, Green Stars don't appear, mainly because the player has to get all Green Stars in order to unlock this galaxy.
Planets and Areas
In the first area, the player must use Yoshi to swing on the flower grapples to reach the Launch Star at the end of the area. There are several obstacles along the way, such as Mines and Bullet Bills. Paragoombas appear in the first mission and are replaced by Choppahs in the second mission. A Toad can also be found on this planet who will shout Yoshi's name when spoken to.
After using the Launch Star from the first planet, Mario lands on a planet with Flipswitch Panels. It has a backdrop showing moving sprites of items from Super Mario Bros.. The player must activate all 21 Flipswitch Panels while avoiding Sentry Beams to reveal the Launch Star.
Electric Maze Area
After landing, Mario finds a Cloud Flower and a fan producing an upward gust. Mario must use the Cloud Flower to maneuver to the Launch Star at the end of the area. More Cloud Flowers are subsequently supplied along the way. There is also a 1-Up Mushroom at the top left that can be reached using the Cloud Flower.
This area contains planets that are made of Shrinking Tiles and Red-Blue Panels. Octopuses and Sentry Beams are found in the area. Mario must avoid all obstacles in order to successfully reach the Launch Star at the end of the section.
Pull Star Area
In the beginning, there are some electrified blocks, followed by a long segment of Pull Stars where Mario must avoid electrical currents, mines, and Paragoombas to reach the end, where a Launch Star is located.
Hammer Bro Planets
The ending platform has three Boomerang Bros., which Mario must defeat to reveal a Power Star (or a Launch Star in the Daredevil run). Note that defeating the Hammer Bros is not necessary for getting the Power/Launch Star to appear.
The Gate Planet
This planet is only accessible during The Perfect Run. It is a small planet with a small house and strongly resembles the Gate in Super Mario Galaxy. Rosalina and the final Power Star are found on this planet. There is also a 1-Up Mushroom behind the house. Mario will still lose a life if he falls off, and will have to redo the level if this happens.
The Ultimate Test
This mission is unlocked once the player gets a total of 240 Stars. The player must complete all the various tasks mentioned above. There are checkpoint flags at the beginning of the Electric Maze Area, the Platform Planets, and the Pull Star Area. Throughout the mission, the player can also speak with the Toad Brigade members. This mission, along with the Daredevil Run, is the only time that the leader is seen sleeping. Yellow Toad is also asleep, and if the player speaks to him, he will mumble about Star Bits, giving the player a hint on how to unlock the final mission.
The Perfect Run
The player must redo the The Ultimate Test mission, but under Daredevil Comet conditions. There aren't any Checkpoint Flags in this mission and, in the first area, the Paragoombas have been replaced with Choppahs and more mines have been added. Additionally, after defeating the Boomerang Bros. at the end of the level, rather than the Power Star appearing, a Launch Star appears that takes the player to the Gate-like planet where the Power Star and Rosalina are located.
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