I read that to unlock world 10 you need to beat "big boss showdown" in less than 8 min. How do I access that? I beat the game including world 9 but cannot find it. Is it a level? Does it include all the bosses including the final boss?
It's in the Menu, not the startup menu but the one that you get to while playing the actual game. I think it's called Moe's Briefcase or something like that.
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Topic: Starfy question
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