In case you haven't already figured it out,
Dodge the two spinning circles. When you are standing on the gray tube( before the
stone that tries to smush you ) Go past the stone person trying to kill you and past 5
doors. ( After about 3 you will come to anotherstoone guy, p*** him and go to the sixth).
You should be on the stair leading up to another door. Go up the stairs to the door, go
through the door and meet Bowser.

Hope this helps,
Unregistered