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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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The world's hardest sudoku - solved | Newspapers | The Guardian
AI Escargot - The Most Difficult Sudoku Puzzle by Arto Inkala (6-Jun-2007) Paperback: Amazon.com: Books
It took three months to create, so how long will it take to crack ...the world's hardest Sudoku? | Daily Mail Online