Instructions:
Click near the "gray ball" to hit it (and make it move in the opposite direction). To hit the ball softly, click near the gray ball. To hit is harder, click a little further away.
To score points, you must hit the "white ball" first (at least once) and then hit the "black ball" (at least once). In each turn, you are not allowed to hit the white ball after you hit the black ball. A turn ends once all the balls stop or once you hit the "gray ball" again. You lose chances when you do not hit both balls in the correct order while meeting the constraint noted above. You gain chances and points if you hit both balls in the correct order.