The 16 numbers are given to you randomly. So there's a little guessing that must be made. I only played this 3 or 4 times and did not succeed. On my last attempt, I got 3 columns and 3 rows to be 8 and 1 column and row to be 7. Which means I played it perfectly, but still could not solve it.
I think there's something more to this puzzle app, but I don't have the patience for it. Nevertheless, the concept has potential.