You have to go to the mirror room on the 2nd floor as Luigi. Get the flower on one of the stools and run through the mirror. Jump into the painting on the right and you'll battle Chief Chilly. Then you'll have the key to Wario's room.
You can play as wario in super Mario 64 DS, but not the first one unless you hack it
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Yoshi, Mario, Luigi, and Wario
Link is not a character in Super Mario 64 DS. The available characters are Yoshi, Mario, Luigi, and Wario.
Mario, Yoshi, Luigi, and Wario
No, you have to be wario.
Wario is 12 years old in that game.
Wario is not playable on New Super Mario Bros. However, he is playable on Super Mario 64 DS.
In Super Mario 64, Wario is not Unlockable, nor any other character for that matter. However, he was added in the DS remake. You'll get him through normal gameplay though, because he is needed to complete the game. (Unless you're a glitchy speedrunner mess)
First, it's super mario 64, not 3. Second you can't.
It isn't possible to get Waluigi in Super Mario 64 DS. Only Mario, Luigi, Wario, and Yoshi are playable characters.
It's Yoshi, Mario, Luigi and Wario.