Normal sudoku rules apply (ie place the digits 1-9, once each, in every row, column and 3x3 box.) Each 3x3 box contains 4 non-overlapping dominoes with the same sum. Sums may be different for different 3x3 boxes.
Normal sudoku rules apply (ie place the digits 1-9, once each, in every row, column and 3x3 box.) Each 3x3 box contains 4 non-overlapping dominoes with the same sum. Sums may be different for different 3x3 boxes.