Ok,after you get 12 stars and beat the first bowser battle,go into 1 big key door[im not sure wich one]roam through the rooms until u find a room with 4 platforms. those are the "pillars".Ground pound each platform and if u did it corect u will hear a chime-like sound.The moat will be draind and a shourtcut/underwater door will be availibale,plus a rabit and a secret course with a blak brick on top of it.CONGATS!!!!!!!!!!!!!!!!!!!!
