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Amazon.com: Win At Sudoku - The complete guide to solving all levels of Sudoku puzzles using pure logic (Christmas Gift: FREE Puzzle Book) eBook : Eardley, Caro: Kindle Store
Excluding anything computerised, what is the hardest puzzle, or game you have ever tried? - Quora
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
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
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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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Arto Inkala | The Chatterjis Blog
In 2012, Finnish mathematician Arto Inkala claimed to have created the "World's Hardest Sudoku". - 9GAG
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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
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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