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Sudoku is a classic logic-based number puzzle that challenges players to fill a 9x9 grid with digits from 1 to 9. The objective is to ensure each row, column, and the nine 3x3 subgrids contain all numbers without repeating any. Starting with a partially completed grid, players must use deduction and reasoning to place the correct numbers in the empty cells. Sudoku requires no mathematical calculations—only patience, focus, and pattern recognition. With varying difficulty levels, from easy to expert, the game appeals to beginners and seasoned solvers alike. Sudoku's simple rules and engaging gameplay make it a popular pastime for improving concentration and problem-solving skills. Whether in newspapers, apps, or books, it remains a timeless brain-teasing favorite.