Place the digits 1 to 9 once each into the 3x3 boxes. Digits may not repeat in the same row, column, or box of the 6x6 grid. Each of the two marked diagonals contains only 3 distinct digits. Digits along an arrow must sum to the value in that arrow's circle. Digits in cages must not repeat, and sum to the small number in the top left corner of the cage.