How do you unlock the cannon outside the castle?
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To open the cannon outside, collect all 150 stars. This is a HUGE accomplishment, and it takes a very long time.
You go to the mirror room as Luigi , then use the power flower that is in there and go through the wario painting on the right
Theres a secret way when you jump out in a tree near the cannon and it will automatically unlocked when you collect all 150 stars.
Hope this helps
You need 150 stars to open the cannon. I heard that you could hop onto a tree by the cannon and slide down. It's supposed to be a glitch I heard but it didn't work out for me.
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