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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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World's Hardest Sudoku Book: 200 of the World's Toughest Sudoku Puzzles: Rinzema, Guy: 9781533034182: Amazon.com: Books
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/cdn.vox-cdn.com/uploads/chorus_asset/file/19984979/Untitled.png "This 25-minute video is the most riveting sudoku puzzle you will ever watch - The Verge")
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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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