Sudoku - Hard
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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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Wicked Sudoku puzzle number 1939560. You should master the game in order to solve this very hard Sudoku. Go over all our tut… | Sudoku, Sudoku puzzles, Hard puzzles
Free Printable Hard Sudoku with the Answer #12262
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Extremely difficult sudoku puzzles: for smart people only . solution at the end of the book. : publishers, Brain river: Amazon.de: Books
Sudoku - Hard A5 Printable Puzzle
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Hard Sudoku Puzzles – Free Printable
Free Printable Hard Sudoku with the Answer #14739
A difficult Sudoku puzzle. The problem is to fill in the blanks with... | Download Scientific Diagram
