This is nothing too big or surprising, but it is worth it anyway. This is in the snow world (second one).
At the first boss (2a) you have to go through the beginning bit first. When you get to the door on the other side, you will see a rock beside it.
Slam on the rock right on top of the little flower on it.
I hope it works for you, because it's something that I tried myself. Good luck!
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