Grand Finale Galaxy
From Lumapedia
Grand Finale Galaxy is the final galaxy unlocked in Super Mario Galaxy.
This galaxy is the Mushroom Kingdom level used during the prologue as Mario, with purple coins scattered about.
List of Stars
Routing Info
Grand Finale Galaxy is located on the back of the Planet of Trials, and is accessible after the player has collected 120 stars with both Mario and Luigi on the same file.
This galaxy always makes up the last two splits in a 242 run, with The Star Festival having to be done as both Mario and Luigi to complete the run.