How to unlock the true 100% ending - Paper Mario: The Origami King

Are you looking for the true 100 percent ending to Paper Mario: The Origami King? It

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Paper Mario: The Origami King — How to unlock the secret ending

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I 100%ed Origami King and I didn't get the secret end, what am I doing wrong? : r/papermario

How to unlock the true 100% ending - Paper Mario: The Origami King

The bottom image seems like a pipe with the number 3 on it, leading to the speculated fast travel room with other pipes. This further proves the pipes in the above image

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paper mario – Matthew Floyd

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Olivia (Paper Mario), Heroes Wiki