What's the world's hardest puzzle?

What is the world's hardest puzzle? There are a lot of challenging puzzles out there, but find out which one is the world's hardest puzzle.

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The World's Most Difficult Jigsaw puzzle, dalmatian edition is double sided, with the same image featuring on both sides. 529 pieces seems more like

World's Most Difficult Jigsaw Puzzle - Dalmatian

World's hardest puzzle? (500p / CM Originals) (Plus a bonus puzzle!) : r/Jigsawpuzzles

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Disney Mickey Mouse Double Sided World's Most Difficult Jigsaw Puzzle 500pcs for sale online

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