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Firstly, for world 4 and 7, আপনি MUST have mini মাশরুম for this process.

Defeat the boss stage in world 2 and 5 with mini mushroom. World 5 is a bit trickier to beat with mini mushroom, so good luck!

In world 2, all আপনি have to is ground pound the শুঁয়াপোকা 3 times. It's a bit trickier than it sounds but you'll do alright.

When আপনি do defeat the boss stage, আপনি will proceed in a pathway under the floor.

Good Luck!

^This.