What Makes Sudoku Easy, Medium, Or Hard? Here's The Science Behind Sudoku Levels

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How do the creators of Sudoku puzzles determine if their puzzle is easy or hard, or, in fact, if it can be solved at all, without guessing? - Quora

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What Makes Sudoku Easy, Medium, Or Hard? Here's The Science Behind Sudoku Levels

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How do the creators of Sudoku puzzles determine if their puzzle is easy or hard, or, in fact, if it can be solved at all, without guessing? - Quora

Sudoku Puzzles - Superstar Worksheets