This is a link to his minimum sudoku page, but I also highly recommend the article he wrote here on sudoku complexity for those interested in some of the math, especially a more readable discussion of Gary McGuire’s research on the topic. Gordon Royle at the University of Western Australia maintains a repository of N-17 sudoku, and the evil sudoku puzzles in this section are derived from the patterns he provides on his site. There are still a quite large number of possible puzzles (most variations of equivalent puzzles of the same form) that can be created. Sudoku masters have known for some time that the absolute minimum number of clues a puzzle can have and still be valid is 17. Incorrectly filled fields are marked red. Find out if you correctly solved the puzzle after pressing the the button 'Check'. Be prepared that your head very tormented. But as the number of sudoku clues decreases, these contraints make other solutions much more likely. Evil sudoku is only for experienced sudoku solvers. This is pretty easy if the sudoku has lots of clues because it winds up requiring very specific values in very specific spaces of the solution.
Each puzzle must meet the constraints required to solve it, but additionally it must be constrained enough to require a unique and specific solution. You can use logic retaining in your memory the possible candidates for each cell, row, column, and region or you can write the candidates down. There are two ways to approach the Sudoku Solving process. Because a valid sudoku puzzle must have exactly one unique solution, coming up with a sudoku puzzle can often be more challenging than solving one. To solve the hardest puzzles and games, use advanced strategies such as X-Wing, XY-Wing, and Swordfish. Evil Sudoku includes some of the most challenging Sudoku puzzles that are mathematically possible.
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