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sudoku christmas Advanced Strategies: Some solvers use advanced strategies, such as X-Wing, Swordfish, and XY-Wing, to solve complex puzzles. Timed Mode and Leaderboards: For those who enjoy a bit of competition, Sudoku for iOS features a timed mode that challenges you to solve puzzles within a set time limit. sudoku without adssudoku denver post With its simple yet challenging gameplay, Sudoku has evolved over the years, introducing various variations to keep players engaged. sudoku denver post Whether you are a beginner or a seasoned solver, Sudoku offers a variety of difficulty levels to keep you engaged and challenged. sudoku tips expert 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.
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