Normal sudoku rules apply. Progressive Divisor numbers are numbers where the first digit is divisible by 1, the first two digits taken as a two-digit number are divisible by 2, and so on. There is a nine digit Progressive Divisor number in row 1 of the grid, written from left to right. Each of the digits in row 1 is also in a distinct non-overlapping invisible region that sums to 3x the digit's value. These regions may branch, and digits may repeat in regions if allowed by other rules. The size and shape of these regions must be determined by the solver. Clues outside the grid indicate the first N cells in the row/column, read from outside-in, are a Progressive Divisor number, where N is the digit in the cell next to the clue. The cages hold two digit numbers that are either divisible by both digits (eg 24) or neither digit (eg 98).