I have 2 questions.
A) What are the little black cannons for and how do you get to them?
B) How do you get to world 4?
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I really don't know what you mean by the black cannons but you can get to world 4 by beating World-2 boss with mini-mario. He can't hurt him I know but you can ground pound it
Keepin' it real, G.I.M.T
The black cannons are warps to skip one level and to get to them you need to find an alternet ending on a level near by them usually they are alternate levels marked A, B, or C....hope it helps yah!
Mario_king666
The black cannons warp you 2 another level. You have to find a secret exit to a level. These are not very useful after you have gotten to that world.
To get to world 4 you have to beat the boss at the last castle of world 2 as mini-mario
Anyway I hope I helped
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