From the Super Mario Wiki
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Mario, Luigi and Starlow come to this place because it is undergoing unusual conditions. Mario and Luigi, confused, sit and wonder what is going on. Toadbert then enters the room, saying that if the brothers activate Bowser's pressure points, the Koopa King may be able to do a Body Slam. Once the Mario Bros. activate his pressure points by Spin Jumping near a wheel-shaped bone and drilling into the activated pressure points, Bowser gains the Body Slam ability.
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