Things You'll Need
Instructions
Go to the first mini-castle in the world one as Raccoon Mario.
Go to the very end of the first screen of the mini-castle. You will find a skeleton koopa troopa walking around a door that you can enter.
Kill the skeleton koopa troopa.
Run to the end of the screen with the door where the skeleton koopa troopa was but do not go through the door.
Run away from the door and jump out of the opening that is available to you. You should have enough speed at this point to be able to fly as Raccoon Mario.
Fly up against the wall to your right and continue pressing right. Eventually you will make it over the wall but Mario will be off screen.
Run to the right when on top of the wall. Do not stop until the screen stops moving to the right.
Press up. You will enter a secret door that is out of view.
You will enter a secret room with a treasure chest. Walk toward the chest to open it up and reveal a warp whistle.