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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
The world's hardest sudoku - solved | Newspapers | The Guardian
Problem solved... sort of: Mathematicians come up with formula to complete every Sudoku (but trying to understand it could take even longer than doing the puzzle) | Daily Mail Online
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The world's hardest sudoku - solved | Newspapers | The Guardian
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Excluding anything computerised, what is the hardest puzzle, or game you have ever tried? - Quora
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The hardest Sudoku in the world" that a mathematical expert created over three months - GIGAZINE
World's hardest sudoku puzzle ever: Can you solve the most baffling brainteaser ever devised? - Mirror Online
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Problem solved... sort of: Mathematicians come up with formula to complete every Sudoku (but trying to understand it could take even longer than doing the puzzle) | Daily Mail Online
Problem solved... sort of: Mathematicians come up with formula to complete every Sudoku (but trying to understand it could take even longer than doing the puzzle) | Daily Mail Online
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