Normal sudoku rules apply. Digits separated by a white Kropki dot must be consecutive. Digits separated by a black Kropki dot must have a ratio of 1:2. Sets of digits separated by a white Kroopki ‘doot’ (the long, ellipse-looking things) must have their respective sums be consecutive. Sets of digits separated by a black Kroopki doot must have their respective sums be in a 1:2 ratio.