Normal sudoku rules apply. Digits on a thin grey line must be between the digits in the circles on the ends of that line. Digits on a thick blue line must NOT be between the digits in the diamonds on the ends of that line. Digits in those diamonds must differ by at least 4. A black dot joins two digits where one is double the other. A white dot joins two consecutive digits. Disjoint Groups: Cells with the same position in the boxes contains number from 1 to 9 i.e no number can repeat in the same position in the boxes.