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Solving Sudoku by Trial and Error
I'm new to sudoku. So, I put down four (the one that is marked red) but it was marked red which means it is a mistake but I can't figure out what
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Example of an order-3 Sudoku puzzle. This particular grid is... | Download Scientific Diagram
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Do I have to guess? Is this puzzle at a point where I have to guess the next number? Am I missing something? : r/sudoku
