just played a week ago so i owe it to you if your still interested........
On the floor 2 down from the boss, step on the star switch so that the end sticks out towards you(-__----) like that.then go up a floor and hit the star switch thats near the flame thing.A hole should appear close to (but not exactly in) the northeast corner...if it drops you on the ledge, but you land on a star switch and set it off, try it so it looks like (-----_-). if that still doesn't work, try every hole on the floor above.
sorry i cant give you the exact hole, but smrpg took up all the space in my memory.
you really dont know, do you??