Is suposed to be the hardest sudoku ver, and i have no idea what to do : r/ sudoku
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Sudoku Solving Techniques
File:Sudoku puzzle hard for brute force.jpg - Wikimedia Commons
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World's Hardest Sudoku Puzzle
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The world's hardest sudoku - solved | Newspapers | The Guardian
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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
