When got to hole 12 it was starting to get a little windy and cooler. So decided to use an 7 iron instead of 8 iron. I hit my tee shot to the center of the green and everyone said nice shot, but the ball kept rolling toward the hole. Than the ball disappeared. I was thinking it either went in to the cup or there is a downward slop on the back of the green. When we all arrived at the green there was no downward slop and we did no see my yellow ball. One person check the sand trap first, but there was no ball in there. Than I said check the cup and when he look in the cup he started yelling and everyone ran to the cup started yelling and congratulating me. I have been playing golf for 30 years and finally got my hole.