Normal sudoku rules apply. Numbers in cages cannot repeat, and must sum to the total in the upper left corner of each cage. BUT the solver must determine what the cage totals are (each cage total would appear in the blue cell of its cage). In addition, every cage total must be divisible by the first and last numbers in the row AND column that contain that cage total. For example, if the cage total in R1C4 is 6, then R1C1, R1C9, R1C4 and R9C4 can only contain 1s, 2s, 3s, or 6s.