On the first stage, get to the middle of the top platform, jump and swing your hammer and you'll see the outline of an invisible bubble. Keep hitting there and you'll get a key that opens a door to a hidden password screen. Inside will be 8 bubbles, which you need to hit in the following order to go to the reverse stages:
Unlockable How to Unlock Reverse Rounds Spade, Heart, Diamond, Club, Club, Spade, Heart, Diamond
Contributed By: ReyVGM.
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