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What is the minimum number of numbers to place on a Sudoku board to solve it? - Quora
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The world's hardest sudoku - solved | Newspapers | The Guardian
Magic Word Square: Hardest Sudoku Puzzle
World's hardest sudoku puzzle ever: Can you solve the most baffling brainteaser ever devised? - Mirror Online
Can you solve the world's hardest Sudoku?
It took three months to create, so how long will it take to crack ...the world's hardest Sudoku? | Daily Mail Online
The Worlds Hardest Sudoku Puzzle
It took three months to create, so how long will it take to crack ...the world's hardest Sudoku? | Daily Mail Online
True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku? | Daily Mail Online
AI Escargot - The Most Difficult Sudoku Puzzle by Arto Inkala (2007-06-06): Amazon.com: Books
What is the toughest sudoku in world? - Quora
Magic Word Square: Hardest Sudoku Puzzle
The World's Hardest Sudoku - try it now - The TechGears
AI Escargot - The Most Difficult Sudoku Puzzle by Arto Inkala (6-Jun-2007) Paperback: Amazon.com: Books
Can You Solve the Hardest-Ever Sudoku? - ABC News
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
World's hardest sudoku: Can you solve Dr Arto Inkala's puzzle? - Mirror Online
The world's hardest sudoku? | Newspapers | The Guardian
