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Nintendo DS - Super Mario 64 cheats

Unlock Mario Key - Beat Goomboss behind 8-Star Door in the Rec-Room

Unlock White Room Key - Catch all the Shining Rabbits

Unlock Wario Key - With Luigi in Mirror Room, hop into Wario's Painting 
and beat the Giant Ice Bully

Unlock Luigi Key - Beat King Boo in Luigi's Painting on the 3rd Floor 
of Big Boo's Haunt

How to get in the white room:
The first thing you have to do is to get Luigi  then go to the 
second floor and go in the room the takes you where the other portrait 
of Luigi is then get one of those flowers and the go thru the mirror and 
to the door  then you  are in the white room and there is star