Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sums of the digits within each sub-region are equal to each other. In sub-regions there can't be the same digit repeated.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The sums of the digits within each sub-region are equal to each other. In sub-regions there can be the same digit repeated.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The relation signs mark the relations between the sums of the digits of the sub-regions.

Fill in the grid so that every row, every column, and every 3 x 3 box contains the digits 1 through 9. The relation signs mark the relations between the sums of the digits of the sub-regions.