On world 5B, at the end just before the flag, there is a porthole blocked by 2 building bricks. How do you break these and where does the porthole take you?
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Do you mean the one on the top of the screen? You break the blocks using a blue shell(see question at the top if you don`t know how). And if I remember correctly this takes you to the green pipe above world 5b on the map.
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