I'm in World 3 of New Super Mario Bros 2 on 3DS. There is a cannon (see image below) which I assume will take me to the second special world. But I have tried every level around it and cannot find any secret exits.


How do I get to the cannon?


As shown in this video (from 1:04)

In the tower as mini mario take the tiny pipe just before the half way point, and follow that branch.

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