Umm...
Ahh yes! The insane moving wall thing.... actually, getting to the secret exit is easier than getting to the normal exit!
Ok, after the first section of moving floor, go in the pipe, then, go right, until you get past the corridor after the first stairs you see. Then, when the floor rises, get on there, and jump up above the game screen. Go left, and soon you shall drop into the key chamber.
Just wait till you try and get every Dragon Coin in the whole game... I did, and it wasn't TOO hard...
"Tonight, I`ll make an old family recipe. Pickled dandelions with barnacles in a diesel marinade!" - Prof. E. Gadd