Get all 150 stars
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it is not stars it is a world
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 the cannon in the worlds
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.
in world 1 at the tower there is a red flag that you need to get to unlock the cannon.