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I haven't done it yet, but you're supposed to collect all 120 stars. After that, the Canon should be open. Also, you're talking about Super Mario 64 right, because that's the only "canon outside the castle" I know of. Anyway, there you go.
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Earn +20 ptsQ: How do you unlock the cannon outside the castle?
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How do you unlock the cannon outside the castle in super Mario 64ds?
it is not stars it is a world
How do you unlock the cannon outside the castle in super Mario 63?
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.
How do you unlock level 7-6 in Super Mario Bros Wii?
By getting a cannon or by winning the fifth castle and then the sixth castle.
On super Mario 64 how do you unlock the cannon outside?
Get all 150 stars
How do you open the cannon outside the castle in Mario 64?
You open the cannon by getting 120 stars. After you've gotten 120 stars, you can go outside and fire the cannon. You do not need to find a Bob-omb buddy.
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