The Green Power Star is a green colored Power Star that appears in Super Mario Galaxy. There are three Green Power Stars in the game. They are hidden in some galaxy. Collecting all 3 Green Power Stars rewards you with three new Trial Galaxies- the Rolling Gizmo Galaxy, Loopdeeswoop Galaxy, and the Bubble Blast Galaxies. You can now access these galaxies. A total of 120 Green Power Stars appear in Super Mario Galaxy 2, so get ready for some action!