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Sadly (I do know how you feel, you know) the only way open the cannon outside the castle is to collect all 150 stars. When you have done this, just walk up to it and it should be open. If you have an Action Replay card, however, there is almost certainly a cheat you can use to get the cannon before this.
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How do you open the cannon in the courtyard of the castle on super Mario 64 ds?
Collect 120 stars
How do you get on top of the roof in Super Mario 64?
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.
On super Mario 64 how do you unlock the cannon outside?
Get all 150 stars
How do you open the cannon on super Mario 64?
If you mean the outside cannon you have to collect 120 stars. If you're talking about the ones in the courses you have to talk to a bob-bob buddy (pink bob-bob).
Can you play multiplayer minigames in super Mario 64 ds?
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.
