Similar to the Magic Square 1 - 49, but this one is 1 to 81. There are some unfilled squares in the middle, have fun. Of course, there is always a solution. If you have any question of comments, please feel free to email me or leave a comment in this forum. I will re-direct the comment to my brother.
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message from my brother, Ding Yee Cheung:
This Magic square is being arrange with No.1 to 81, Any row, column, and 2 diagonal lines. Specially one of the cross-line I arrange it from 1--to--81 in sequence.
Please ask your friend, professor or anyone about this Magic Square does it appear before.