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.

It took three months to create, so how long will it take to crack the world's hardest Sudoku?

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50 Of The Hardest Puzzles That Are So Entertaining To Start Yet So Difficult To Finish

50 Of The Hardest Puzzles That Are So Entertaining To Start Yet So Difficult To Finish

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One of the most hardest and most difficult jigsaw puzzles there is. Nearly an impossible and unsolvable puzzle. For extra difficulty it has only one

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50 Of The Hardest Puzzles That Are So Entertaining To Start Yet So Difficult To Finish

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Solving World's Hardest Puzzles :

Can you solve the world's hardest puzzle?, The Independent