foreach (Rocks r in rocksList)
            {
                String debugR = String.Concat("R", i.ToString(),", X=", r.PositionX.ToString(), " , Y= " , r.PositionY.ToString());
                bb.Text(0, textPos, debugR);
                if (r.PositionY < HEIGHT)
                {
                    r.PositionY += r.Speed;
                }
                else
                {
                    Random randomMS = new Random();
                    Random randomX = new Random();
                    Random random = new Random();
                    int minSpeed = randomMS.Next(ROCK_MIN_SPEED, ROCK_MAX_SPEED);
                    r.ResetRock(randomX.Next(0, 962), ROCKS_INITIAL_Y, random.Next(0, 4), random.Next(minSpeed, ROCK_MAX_SPEED));
                }
                i++;
                text