After exiting the secret doors, I would expect that some unopened world will open, but strangely, some of them are not appear/open at all
Even though I have tried few times, still won't open
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Which secret doors are you talking about? If you are not specific, I can't properly answer your question. But I'll try answering this one.
If you mean secret exits, once you jump onto the red flag pole, it will open up a secret path.
If you mean doors to a boss battle and after you've beat the boss, it will just take you to the next world. It won't unlock hidden worlds.
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