World's hardest sudoku: Can you solve Dr Arto Inkala's puzzle? - Mirror Online
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It took three months to create, so how long will it take to crack ...the world's hardest Sudoku? | Daily Mail Online
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Watch this genius solve insanely difficult sudoku puzzles
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AI Escargot - The Most Difficult Sudoku Puzzle by Arto Inkala, Paperback | Barnes & Noble®
Is suposed to be the hardest sudoku ver, and i have no idea what to do : r/ sudoku
The world's most difficult sudoku puzzle :: japanesetranslator.co.uk
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World's toughest sudoku is here... can you crack it?
