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best iphone sudoku app 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. what is sudoku and how to play This technique, known as "naked single," is a fundamental strategy that can often lead to quick breakthroughs. sudoku book nearby Origin and History: Sudoku originated in Japan in 1984, where it was called "Su Doku," which translates to "single number." The game quickly gained popularity in Japan and later spread to the rest of the world. Tips for Solving Sudoku Puzzles Start with the easiest clues and work your way up to the more challenging ones. print my sudoku Known for their challenging yet satisfying gameplay, Sudoku puzzles are a great way to keep your mind sharp and entertained. print my sudoku
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