public void ClearBall()
 {
     for (int i = Balls.Count - 1; i >= 0; --i)
     {
         if (Balls[i].isNewGame)
         {
             Balls.RemoveAt(i);
         }
     }
     for (int i = BallsMore.Count - 1; i >= 0; --i)
     {
         if (BallsMore[i].isNewGame)
         {
             BallsMore.RemoveAt(i);
         }
     }
 }
 public void AddBallMore(Ball ball)
 {
     BallsMore.Add(ball);
 }