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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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Free Printable Hard Sudoku Puzzles
Sudoku Hard Strategy and Techniques level 4 game 1 | Suresolv
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Free Printable Hard Sudoku with the Answer #13553
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Free Printable Hard Sudoku with the Answer #12262
1000 Easy to Hard Sudoku Puzzles: Pretty Pocket-Size Sudoku Puzzle Book for Adults - Easy to Hard Sudoku Puzzles with Solutions (Brain Games Book) (Paperback) - Walmart.com
Sudoku #589 and #590 (Hard) - Free Printable Puzzles | Puzzles.ca
