From the Super Mario Wiki
Retrieved from "https://www.mariowiki.com/index.php?title=Giant_Star&oldid=2329434"
The Giant Star is a Power Star-like object that appears in Super Mario 64 and Super Mario 64 DS. In the Nintendo 64 version, the Giant Star looks like a Power Star that is bigger than usual. In the Nintendo DS version, a tiny rainbow in the form of a circle surrounds the Giant Star, as well as a few extra sparkles.
The Giant Star can be obtained by defeating Bowser in the final Bowser level, Bowser in the Sky. After being defeated, Bowser will vanish, revealing the final star, the Giant Star. Touching the star ends gameplay, showing a cutscene in which Mario transforms into Wing Mario and automatically flies away via a Triple Jump. After returning to Princess Peach's Castle, Mario then uses the Giant Star to release Princess Peach from the stained glass window she was trapped in above the entrance to the castle.