Normal sudoku rules apply. Each set of three adjacent digits on a peach line contains one each from the sets of {1,2,3}, {4,5,6}, and {7,8,9}. Each set of three adjacent digits on a teal line contains one each from the sets of {1,4,7}, {2,5,8}, and {3,6,9}. A black dot joins two digits of which one is double the other. Each main (9-cell) diagonal contains only three distinct digits.