I can only assume that you are referring to Super Mario 64 DS; otherwise please state your question more clearly.
You need to have beaten the 2nd Bowser battle, activated the ? switch and rescued Luigi.
You need 31 stars. Many people say that you only need 30, but you really need 31. You need 30 to unlock Dire Dire Docks. Then you need to get the first star, Board Bowser's Sub. Then you can beat Bowser in the Fire Sea, and you will get the key to the second floor. Go into the door with the red on it as Luigi and grab a Power Flower. Go into the picture of Wario. Go through the course and fight Chief Chilly. Then you will get the key to Wario's door.
Wario is NEVER in the Super Mario Galaxy series. I have both games and I've beaten them both with 242 stars. No Wario. The only playable characters are Mario and Luigi.
After you get Luigi and 50 stars, go to the next floor AS LUIGI, go to the mirror room. On you right will be a Luigi painting, but in the mirror it will be Wario. Get one the the flowers, this will turhn you invisible, and go threw the mirror, jump into the Wario painting on the other side. Go to the end and beat Chief Chilly, and that's Wario.!!!
you can only spin yoshies with wario. once you've hit a yoshi with wario, it will be stunned, and floating stars will appear on top of its head. get close to the yoshi and grab him with A. rotate the joystick to make it spin.
Beat the Chief Chilly (Ice Bully). You need to be Luigi. Go into the mirror room and become invisible. Jump into the mirror and jump into Wario painting. You beat the Ice Bully and then you will unlock Wario's key. Happy Wario!
2 stars
To fight Bowser for the last time you need 80 stars or 70 stars. To complete the game you need 120 stars.
You need either Wario, Peach or Toad to unlock him.
You need to include the name of the game for us to answer correctly.
You first need to have at least 30 power stars, have defeated Bowser for the second time, and you also need to be Luigi to unlock Wario. When you enter the castle, go up the stairs and into the wooden door with the big lock on it. Go up the winding stairs, through the door and you should be in a room with a white and blue checkered floor (if I remember correctly). In this room, there are 2 doors - one of them leads to a room with a mirror in it and a Luigi portrait. In the mirror you should see that one of the walls has a Snowman Land painting on it; that the Luigi portrait is actually a Wario portrait, and that one of those concrete pillars is a Power Flower to make Luigi invincible. Use it and go through to the mirror, and jump through the Wario portrait. Defeat the level to get Wario's key. Then go back to the Rec Room and go through Wario's door.
You will need Donkey kong and Yoshi.
He lives in Wario World. To be more specific, he lives in Wario Land in Wario World