Wow, congrats on the progress you made! Unfortunately the Game Frame source is hard coded for a single 16×16 grid, and it won’t play nice with the Matrix library. It sounds like using a proper 16×16 grid is going to be the easiest path to success. I’d try the one offered from RGB-123 here:
http://rgb-123.com/product/1616-16-x-16-rgb-led-matrix-black/
Report back!