Small issue : After the second button mash is done, the book puzzle is active again, which reset the whole thing back to the start.
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No, I mean that after the puzzle, there's three button mashes to push out the egg.
But during the third button mash, the book puzzle is active again, and if you successfully do a step of said puzzle in the middle of the button mash, the game goes back to before the first button mash, forcing you to start over.