Defeat the bosses whilst being tiny Mario. After beating them, Mario will fall under a small path, and you will end up in World 4 or 7.
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Ok so on Super Mario Bros for the Nintendo to get to world 4 you have to go to world 2 and defeat it as tiny Mario then to get to world 7 you have to go defeat world 5 as tiny Marion there that is how you do it
defeat the boss from world 2 and 5 with mini Mario
First go to the world 3 last castle or world 6 last casltle if you are mini mario, then you beat bowser there is a little hole and it leads you to world 4 and 7.
you gave to finish the castles of each world as mini mario(the one that you can barely see)
beat world 6