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Pseudo coup

All Penny had to do this week was fill in the missing numbers so that each row, each column and each three-by-three square all had each of the numbers 1 to 9. In printing out the puzzle Joe had interchanged some of the three-by-three squares. Penny worked out which and filled in all the missing numbers. What number did Penny place in the small shaded square?

WIN £15 will be awarded to the sender of the first correct answer opened on Wednesday 19 May. The Editor’s decision is final. Please send entries to Enigma 1591, New ������ý,…