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About sudoku hard - hard sudoku

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Naked and hidden singles are the best squares to resolve. A naked one is whenever a number can only go in a single possible cell. A concealed single is when there is only cell for a presented candidate. In absolutely free on the internet hard sudoku, you may also help https://sudoku-hard---hard-sudoku66431.blogrelation.com/32629233/5-essential-elements-for-sudoku-hard-hard-sudoku

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