Don't waste your money upgrading your bowling balls, it doesn't matter on Alley 13. You can throw a better ball a certain way and get a strike and the do the same again and you'll will have an open frame. It's a fun game but beware it's rigged. Again don't waste your money. Alley 13 you won't get past because it's the last level and even if your bowling balls are maxed out, there's no way to win Alley 13.