     override func didMoveToView(view: SKView!)
     {
         // Fire the notifiers
-        for notifier in notifiers
+        for notifier in _notifiers
         {
             notifier.gameSceneDidAddToView();
         }

    func didBeginContact(contact: SKPhysicsContact!)
    {
        // Fire the notifiers
        for notifier in notifiers
        {
            notifier.gameSceneDidBeginContact(contact);
        }

    {
        // Handle time delta.
        // If we drop below 60fps, we still want everything to move the same distance.
        var timeSinceLast = currentTime - self._lastUpdateTimeInterval;
        self._lastUpdateTimeInterval = currentTime;
        
        if (timeSinceLast > 1)
        {
            // more than a second since last update
            timeSinceLast = 1.0 / 60.0;
            self._lastUpdateTimeInterval = currentTime;
        }
    
        self.updateWithTimeSinceLastUpdate(timeSinceLast);
