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99 of the most difficult Sudoku puzzles in the world: Level Hard Sudoku Puzzle Book. 99
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The 10 Hardest Logic Puzzles Ever Created
The 10 Hardest Logic Puzzles Ever Created
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![Very hard difficulty Sudoku board used for testing (17 givens) [18]. | Download Scientific Diagram](https://www.researchgate.net/publication/256169416/figure/fig9/AS:296535351939082@1447710945535/Very-hard-difficulty-Sudoku-board-used-for-testing-17-givens-18.png "Very hard difficulty Sudoku board used for testing (17 givens) [18]. | Download Scientific Diagram")
Very hard difficulty Sudoku board used for testing (17 givens) [18]. | Download Scientific Diagram
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Hardest Sudoku Puzzles
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What is the most difficult level sudoku puzzle?
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True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku? | Daily Mail Online
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Hard Sudoku Puzzles for Kids - Free Printable Worksheets
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