Go to the Rhynocs N' Clocks level. There will be a door on the area near the vault. The door is the entrance to Chateau Ripto level. In the level you will reach to Ripto's Throne room, and will have to fight Ripto. Once you fight him, he will release Professor (and get attacked by Butler). Once Professor is released (and you get the warp device), he will return to his secret lab. The entrance is near the pink pig playground in Dragon Shores. Enter by using super charged lightning breath on the gold thing. He will only reward you (and end the game) when you have all the hearts.
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