A Sudoku a day keeps the doctor away - Sudoku Technique: Cross-Hatching As below puzzle, we select 3 and draw lines and find out the left-center 3x3 subgrid only 1 box (r6c2)
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Sudoku 12 x 12 Level 3: Medium Vol. 16: Play Sudoku 12x12 Twelve Grid With Solutions Medium Level Volumes 1-40 Sudoku Cross Sums Variation Tra (Paperback) | The Reading Bug
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Cross Medium to Hard 400 Puzzles Printable PDF - Etsy | Puzzle books, Challenging puzzles, Sudoku puzzles
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