Normal 7x7 sudoku rules apply:Place the digits 1 to 7 once each in each row, column, and region. Region sum lines: Box borders divide lines into segments with equal sums. The sum for different lines can be different. Killer cages: Digits in cages sum to the total in the top left hand corner if given. If no total is given, cages sum to the segment sum of the region sum line going through them.