3x3 magic square 25 total
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There are a few ways to do it, i think. for a 3x3 board you go diagonaly up, then over right one.
Every number you put in it must add up to 15 vertically, horizontally and diagonally.
its impossible
Sum = 3 x centre
Excluding reflections and rotations, there is only one 3x3 magic square using 1-9.