@Override
  public void cleanup() {
    localRootNode.removeLight(ai);
    localRootNode.removeLight(dl);

    this.app.getTimer().reset();
    rootNode.detachChild(localRootNode);
    viewPort.removeProcessor(niftyDisplay);
    audio.stop();
    nifty.exit();
    cam.setRotation(Quaternion.IDENTITY);
    cam.setLocation(Vector3f.ZERO);
    cam.setViewPort(0, 1, 0, 1);
    super.cleanup();
  }