anchor.diff:  
     loader.load().last.then((p) {
       game.scene.onFrame.listen(world.update);
  +
  +    var score1 = 0;
  +    var score2 = 0;
  +
  +    var message = new Label('Press space to start')
  +          ..addTo(game.scene)
  +          ..align = 'center'
  +          ..position = new Vector2(400.0, 40.0);
  +
  +    var counter1 = new Label(score1.toString())
  +      ..addTo(game.scene)
  +      ..align = 'center'
  +      ..position = new Vector2(20.0, 40.0);
  +
  +    var counter2 = new Label(score1.toString())
  +      ..addTo(game.scene)
  +      ..align = 'center'
  +      ..position = new Vector2(780.0, 40.0);
   
       var controller1 = new ArcadeKeyboardController(game.keyboard)
         ..keyUp = Keys.A
  
positive.code:     });
  
      var paddle2wallCollision = new StaticBodyOutOfBoundsCollisionCheck()
  
        ..collider1 = body2.collider
        ..collider2 = world.collider;
  
  
negative.code: 
      game.keyboard.onKeyDown.where(((e) => e.keyCode == Keys.SPACE)).listen((e) {
        ballbody.speed.setValues(100.0, 200.0);
        message.runAction(new FadeOut(1));
      });
    });
  
  