The Grandmaster Galaxy is a galaxy in Super Mario Galaxy 2. It is the last galaxy to be unlocked in the game The galaxy is located in World S. This galaxy is unlocked when Mario gets all 240 Power Stars, just like the Grand Finale Galaxy in Super Mario Galaxy. It is an obstacle course with puzzles and enemies. This galaxy contains two Stars: one for completing the level and another one for doing it again under Daredevil Comet conditions. In the latter case Mario gets the Star from Rosalina.

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