Golden Sum by Alexander Stewart FREE

 Golden Sum comes from Alexander Stewart. It's a pure math puzzle.  The instructions were not written clearly. With trial & error I figured it out.

Each of the 3 images shown is an actual solution.

At the start of each puzzle, there are 3 numbers. 2 are beige and they are adjacent. 1 is gold. The gold number can be anywhere on the board. Your task is to add the 2 beige numbers and place their sum on another adjacent cell. The new cell will be beige.  Keep picking 2 beige numbers to create another number and eventually create a number whose sum will be adjacent to the gold number.

I don't know how many levels there are. I've done about 40.

Oh yes, starting at level 33 there are 2 gold squares to solve.

https://itunes.apple.com/us/app/golden-sum/id1352755078?mt=8
https://alexanderstewart.github.io/