It's not endless, it's just long. You must have 70 stars to pass.
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The endless staircase is through a door in the Star Room, which is accessible from the Upper Hallway. Note that you need the Red Shine Sprite to get into the Star Room. There is also a shortcut to the staircase from the Main Hall. Just stand on the platform under the huge sun on the wall, then use Rocket FLUDD to blast up through the ceiling. (Rocket FLUDD is hidden in a secret room in the castle.)
You don't.Wow, that's soooooooooooo helpful.
Mario Bros. Super Mario Bros. Super Mario Bros. 2 Super Mario Bros. 3 Super Mario World Super Mario Land Super Mario World 2 Super Mario Land 2 Super Mario 64 Super Mario Sunshine New Super Mario Bros. Super Mario Galaxy New Super Mario Bros. Wii Super Mario Galaxy 2
In the Nintendo 64 version you need 70 stars. In the DS version you need 80 stars.
It is super Mario 64, Super Mario galaxy, and Super Mario galaxy 2.