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sudoku beginner printable pdf def isValidSudoku(board): def is_valid(board, row, col, num): for i in range(9): if board[row][i] == num or board[i][col] == num: return False if board[3 * (row // 3) + i // 3][3 * (col // 3) + i % 3] == num: return False return True for i in range(9): for j in range(9): if board[i][j] != '.': if not is_valid(board, i, j, board[i][j]): return False return True Step 2: Test the function with a sample Sudoku grid. With its simple yet challenging rules, Sudoku has become a staple in many puzzle books and mobile apps. sudoku grid printable web sudoku extreme Whether you are a seasoned Sudoku solver or a beginner looking to sharpen your problem-solving abilities, Sudoku for iOS is an app that promises endless hours of entertainment. sudoku grid printable Where to Find Samurai Sudoku Printable Puzzles: If you're interested in trying Samurai Sudoku, you can find printable puzzles online. The Origin of the Hardest Sudoku: The concept of Sudoku originated in Japan in the 1970s, and since then, it has gained immense popularity worldwide. sudoku difficile

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