Challenger
Fill each square with a number, 1-9. Horizontal squares should add to the totals on the right, vertical squares should add to the totals on the bottom and diagonal squares should add to the total in the upper and lower right.
Fill each square with a number, 1-9. Horizontal squares should add to the totals on the right, vertical squares should add to the totals on the bottom and diagonal squares should add to the total in the upper and lower right.