         
         // Player bullets
         addChild(playerBullets)
+        
+        // Force Fields
+        addChild(forceFields)
+        createForceFields()
         
         // Physics body delegate
         physicsWorld.gravity = CGVectorMake(0, -1)

        view!.presentScene(gameOver, transition: transition)
    }
    
    
}

    private let playerNode: PlayerNode = PlayerNode()
    private let enemies =  SKNode()
    private let playerBullets = SKNode()
    private let forceFields = SKNode()
    
    class func scene(size:CGSize, levelNumber:UInt) -> GameScene {
        return GameScene(size: size, levelNumber: levelNumber)
