Normal sudoku rules apply. In cages, digits must sum to the number given in the top left of the cage. Digits cannot repeat in a cage. Clues outside the grid give the sum of the digits along the indicated diagonal. Digits can repeat along these diagonals. One of the digits from 1-9 is a joker – wherever it appears in the grid, it can count as any digit from 1-9 for cage and diagonal sums, and it can be DIFFERENT for both – but (as in normal killer sudoku) it can only appear once in each cage.