Normal sudoku rules apply. All lines are both Index Lines and Entropic Lines. Ie Index Lines: The digit in the Nth cell along a line (starting from the diamond) indicates the position along the line where the digit N appears. Entropic Lines: Any set of three sequential cells along a line must contain a low (1,2,3), middle (4,5,6), and high (7,8,9) digit. Sum Dots: Digits around the brown diamond may repeat and must sum to the given total.in the cage.