Swarmed by up to 100 balls, create or destroy horizontal and vertical walls using the mouse to guide grey balls into and red balls away from the goal. Blue balls give extra health while fast gold balls yield an extra hundred points. Swarmed by up to 100 balls, create or destroy horizontal and vertical walls using the mouse to guide grey balls into and red balls away from the goal. Blue balls give extra health while fast gold balls yield an extra hundred points.