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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.
You can use the cannon to shoot up to the top of the castle. Yoshi is there in the Nintendo 64 version. After you talk to him, you will have 100 lives.
Get all 150 stars
First, have the adult Mario and Luigi use the Bros. Ball and have them roll into the cannon. Then, have the babies hit the switch, and the cannon should launch Mario and Luigi.
Waluigi is not in the game at all.
either use a cannon or a wing cap
Collect all 120 stars.
get all the stars to unlock the cannon
All 120.
Collect 120 stars
get all of the stars and then jump in the cannon near the lake.
You gotta get all of the stars, then the cannon outside will open up.