You have collect all of the silver bunnies
You will have to speak with Toad to unlock a quest in which you catch rabbits. Once you have completed this quest, you can use the white door for Super Mario 64 DS.
do you mean a winged cap. if so, it is in levels and on top of the castle
You enter the castle, go up the stairs and to the right, into the door with the 1 on it. Then you go through the door with a large red M on it, then whoever you are playing as exits the room as Mario!
No, that would be the door that you get a free star in for finding the secret key in Peach's Castle.
Catch all the glowing rabbits.
Yoshi is on the castle roof in Super Mario 64. Three lives and a flying cap box are also up there.
In Super Mario 64 DS, when you get all the keys from the naughty rabbits running around the grounds and castle, you are able to go inside the white door. SPOILER ALERT: Inside the white door, you hear some Boos laughing. Then you come out with a star in your hand. No secret characters, sorry. By Jontypin
Yes!
That question doesn't make sense please retype that question they probably mean where is the switch in peach's castle and in Mario 64
Walk into the mario door.
When you find ALL the glowing rabbits you get behind the door and get a star. But if you go in again you will here boos
Go in the bushes, then you'll see a rabbit with a key. Just use your tongue and grab him, and he will give it to you.