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scientific american sudoku How to Solve a Beginner Sudoku Puzzle Start with Easy Clues : Focus on rows, columns, and boxes that have the most clues. Here are some key rules to remember: Each row, column, and 3x3 region must contain all the digits from 1 to 5. sudoku tournament online The grid has some of the squares filled in, and these pre-filled numbers are called "givens." The Rules Each row, column, and 3x3 subgrid must contain all digits from 1 to 9. sudoku 12
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