Collect 120 stars
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.
Get all 150 stars
You cannon play multiplayer mini games in Super Mario 64 DS. Are you sure you don't mean New Super Mario Brothers? It has multiplayer mini games.
Get 63 shine sprites, there are actually 64 shine sprites but that last one, you can only get it if you've had the cannon open, because it leads you to the shine sprite if you use it.
Collect 120 stars
You gotta get all of the stars, then the cannon outside will open up.
You must collect all 150 stars, then it will automatically open.
To get on the castle roof of the castle
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.
Get all 150 stars
either use a cannon or a wing cap
Waluigi is not in the game at all.
You will need to collect all 150 stars and the cannon in front of the castle should open and then all you have to do is go in the cannon and blast off.
You cannon play multiplayer mini games in Super Mario 64 DS. Are you sure you don't mean New Super Mario Brothers? It has multiplayer mini games.
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.
All 120.