How do you get to the basement in the castle in the game super Mario 64 ds?

Answer 1

You need to defeat Bowser the first time,then you can go to the bottom floor and Mario will open the door for you,and you go down the stairs,then turn right then there should be a door there,Mario will open it,and your in the basement.

Answer 2

you need to check behind the wine celler,click on the board and a serect passage will open up

Answer 3

beat bowser on the frist floor