A 9 x 9 magic square is given above.

All numbers from 1 to 81 are used

All vertical, Horizontal and both diagonal totals are equal to 369

Also the diagonally opposite and symetrically opposite numbers around the center number 41 will give a total of 82.

Ex. 42 + 40 = 82, 31 + 51 = 82, 64 +18 = 82 like that.