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Perfect Square on Round 4

Can anyone explain why the answer, "457389261" for 11A is not true? I feel that there are two correct sets of answer for that sudoku. Both "457389261" and "487359261" are correct.

Dear Torontonian Zekeriya,

in your solution there is created new perfect square in second column between cells [2,2] and [3,2] = 25!
But there is no grey square. All grey squares are already marked and that's why your solution can't be correct.

I hope that my explanation is understandable.

Karel (Admin)

Dear Karel,
I got it. Thanks for the explanation.
All the best.