Where is the thrid floor in super Mario Nintendo 64?

Answer 1

He is up the stairs you see when you first enter the castle. Then up the stairs you see when you enter that door. Then run around this next room until you see more stairs. Then, when you enter the clock room, run to the left until you hit the wall, then turn around and hop up the giants steps. Then enter the door at the top. Bowser is up the stairs you see at the when you enter. But this requires 70 stars.

Answer 2

after beating bowser in the fire world, you can unlock the door right above the stairs when you first walk in the castle

Answer 3

??????....at the bottem of the pit....