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reddit sudoku Consistency Check : At the medium level, it's easy to overlook a single number that has already been placed in a row, column, or sub-grid. While the basic rules remain the same, Dell Sudoku introduces a new twist by incorporating the use of a 'dell' – a cluster of digits arranged in a specific pattern that must be solved in addition to completing the standard Sudoku grid. best free sudoku app for ipadtricks to solve sudoku For instance, if you find three cells in a box with the numbers 4, 5, and 6, and no other 4, 5, or 6s in that box, you have discovered a triple.
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