Normal sudoku rules apply. Box borders divide blue lines into segments with the same sum. The segment sum is a concatenation of the two digits on the extreme ends (e.g. a line with segments summing to 36 will have a 3 on one end and a 6 on the other). Different lines may have different segment sums. Digits separated by a white dot must be consecutive. Digits separated by a black dot must have a ratio of 2:1 (i.e. one must be double the other).