Normal sudoku rules apply. Every cage in the grid is paired with exactly one other cage of the same colour. Digits may not repeat within a pair of cages, and when combined, sum to a concatenation of the two numbers in the top left corners of the cages. For example, if a 1 cage was paired with a 3 cage, the digits in both cages would sum to either 13 or 31. 0 is allowed to be the leading digit for sums in this puzzle. Digits separated by a white dot must be consecutive. Not all possible dots are necessarily shown.