Oct 19 - Magic Square

At first, we realize we cannot have a big number in the center, because as soon as we add another next to it, it can go over 15. I.e. 9 and 8, 9 and 7, etc.

Therefore we place the big numbers on the edge, in the center columns, away form each other. Then it was kind of trial and error to see where the others fit.

Solution:

6 1 8

7 5 3

2 9 4

Trial and error attempts:

1 8 6         X 9 X

X 9 X         7 X 8

X X X        6 X X

 

X 9 X         X 9 X

7 1 X         7 5 X

X X 8        X X 8  ----> here I realized I'm on the right track, and then played with the rest to get the solution