Normal sudoku rules apply. Cells separated by a single knightâs move (in chess) cannot contain the same digit. Where two cells are separated by a black dot, the digit in one cell is double the digit in the other. Where two cells are separated by a white dot, the digit in one cell is consecutive with the digit in the other. Not all possible dots are given. Adjacent digits along a green line must differ by at least 5. Digits along a grey line must read the same way backwards and forwards. The digit in the grey circle is odd.
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