If you have 6 stars in Super Mario 64 you can go in any door on the ground floor, except for the door with the giant star on it. That door requires 8 stars, and leads to the Bowser level.
Theres No Super Mario 64 For Wii.
Collect all 120 stars and go to the cannon outside. If you are playing super Mario 64 ds get all 150 stars and go to the cannon outside.
Go find it lazy
Get 8 stars,go to the room with the number 8 on it,jump in the Mario painting,defeat Goomboss.
Go to the door with NO stars on it. Open the door and go to the back of the room. Open the door and you have the courtyard!
well before you unlock Mario you have to earn 8 stars. After you earn the 8 stars go to princess peach's rec room. inside the room you will see a door with a 8 on it. when you go inside there will be a picture of Mario and then you will jump in the picture.
Toads have them, bunnies have them and if you guessed it - the moving painting have them as that is where you should go?
For a walkthrough go here: http://www.cheatcc.com/ds/sg/super_mario_64_ds.txt
When you get 150 star you go outside with luigi and go to the cannon, then go on top of the castle and get the rabbit
get all 99 stars, climb the stairs, kick Bowser's butt (hint: when yu let go from swinging him, try to aim for the bombs.)
One way to do it is to get 120 stars. Once you've gotten them, go outside and blast from the cannon to roof.
basically that the next big door is open and to go fight bowser the second time