Falling from the waterfall
When you get ten stars beat the first bowser level you will gain a key. Then go into the door without a star on it then go in to the place with the blue bricks and go in the door with the star on it and jump in the black stuff read the sign and go to hazy maze you will find a place to go to the place with the green cap switch jump in the water and stay were you are do not move when you turn normal again it will sweep you over the waterfall you will fall out of the waterfall outside the castle
Sorry for such a long hint!
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