What is Sudoku? Sudoku (or Su Doku) is a japanese puzzle based on the digits from 1 to 9. You have to find the correct positions for these digits in the field to complete the puzzle. The difficulty depends on the numbers given at the very beginning. Easy? No way if you do not have an idea how to begin. And be aware that a good Sudoku puzzle has only one possible solution and can be solved without trying!
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