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I know I must have solved it some time ago.
That’s it - Coding Games and Programming Challenges to Code Better
Very similar, yet not the same. Here I could invoke the great wizard ‘Xor’. In the other puzzle the grid size could be too large for this approach.
And also (as I understand it), each button in that “Very Hard” puzzle all have the same effect.
In This puzzle here, there are 3 different effects based on the location of the button on the square.
The real difference is that you have to find only one button in this puzzle, whereas you a to find a real solution in the other, and with a variable size. That makes the difficulty “very hard”.
Merlin Magic square solution is a easy one or difficult.