LOSESCREEN:

package
{
    import net.flashpunk.Entity;
    import flash.media.Sound;
    import net.flashpunk.Sfx;
    import net.flashpunk.graphics.Spritemap;
    import net.flashpunk.graphics.Image;
    /**
     * ...
     * @author ...
     */
        public class LoseScreen extends Entity
        {

                public function LoseScreen(x:int, y:int)
                {
                        type = "losescreen";
                        this.graphic = new Image (Assets.playerlose1);
                        this.x = x;
                        this.y = y
                }

        }

}
PLAYERLOSE:

 public class PlayerLose extends World
        {
                public var winscreen:LoseScreen = new LoseScreen(0, 0);

                public function PlayerLose()
                {
                        add(losescreen);

                }
        }
}



package
{
    import flash.geom.PerspectiveProjection;
    import flash.text.engine.TabAlignment;
    import net.flashpunk.graphics.Backdrop;
    import net.flashpunk.World;
    import net.flashpunk.Entity;
    import net.flashpunk.utils.Input;
    import net.flashpunk.FP;
    import net.flashpunk.graphics.Image;
    import net.flashpunk.graphics.Text;
    import net.flashpunk.Sfx;

    /**
     * ...
     * @author ...
     */
    public class GameWorld extends World
    {
        public static var background:Background = new Background();

        public var music:Sfx = new Sfx(Assets.MUSIC);
        public var ball:Ball;
        public static var vPaddle:VerticalPaddle;
        public static var hPaddle:HorizontalPaddle;
        public static var aiVPaddle:AIverticalPaddle;
        public static var aiHPaddle:AIhorizontalPaddle;
        public static var ballCount:int = 0;
        public static var aiSpeed:int = 9;
        public var P1ScoreText:Text = new Text("0");
        public var AIScoreText:Text = new Text("0");
        public var timer:Number = 0;
        public static var pScore:int = 0;
        public static var aScore:int = 0;
        public function GameWorld()

        {
            ball = new Ball(FP.screen.width / 2 - 7 / 2, FP.screen.height / 2 - 7);
            vPaddle = new VerticalPaddle(30);
            hPaddle = new HorizontalPaddle(25);
            aiVPaddle = new AIverticalPaddle(FP.screen.width - 25 - 60);
            aiHPaddle = new AIhorizontalPaddle(FP.screen.height - 25 - 50);
            add(ball);
            add(vPaddle);
            add(hPaddle);
            add(aiVPaddle);
            add(aiHPaddle);
            this.addGraphic(P1ScoreText, 4, FP.screen.width /2 - 70, FP.screen.height /2 -90);
            this.addGraphic(AIScoreText, 4, FP.screen.width / 2 + 20, FP.screen.height / 2);
            P1ScoreText.size = 90;
            P1ScoreText.color = 0x99ccff;
            AIScoreText.size = 90;
            AIScoreText.color = 0xffcc99;
            music.loop();
            add(background);
        }


        public function gameWin():void
        {
            if (pScore >= 9)
            {
                FP.world = new PlayerWin();
            }
        }

        public function gameLose():void
        {
            if (aScore >= 1)
            {
                FP.world = new PlayerLose();
            }
        }


        override public function update():void
        {
            P1ScoreText.text = pScore.toString();
            AIScoreText.text = aScore.toString();

            //aiHPaddle.x = ball.x - Image(aiHPaddle.graphic).scaledWidth / 2;
            //aiVPaddle.y = ball.y - Image(aiVPaddle.graphic).scaledHeight / 2;

            aiHPaddle.moveTowards(ball.x - Image(aiHPaddle.graphic).scaledWidth / 2, aiHPaddle.y, aiSpeed);
            aiVPaddle.moveTowards(aiVPaddle.x, ball.y - Image(aiVPaddle.graphic).scaledHeight / 2, aiSpeed);

            gameWin();
            gameLose();

            super.update();
        }
    }

}