Trial Galaxies

The Trial Galaxies are secret levels found in Super Mario Galaxy. By recovering three special Green Power Stars, three Green Lumas will appear and activate a Green Launch Star. By using it, Mario can access a planet orbiting the Comet Observatory. There, three Green Lumas can each transform into Launch Stars that will take Mario to the three Trial Galaxies.

The Trial Galaxies are the Rolling Gizmo Galaxy, the Bubble Blast Galaxy, and the Loopdeswoop Galaxy. Additionally, once you have got all 120 stars with Luigi as well as Mario, a forth Green Luma will appear and allows you to travel to Grand Finale Galaxy.