         self.scoreText.zPosition = 100
         self.addChild(self.scoreText)
     }
+    
+    // MARK: - UPDATE
     
     override func update(currentTime: CFTimeInterval) {
         // Lock Hero's X Position [Tina]

        craneHook.physicsBody = SKPhysicsBody(rectangleOfSize: CGSize(width: 130, height: 165))
        craneHook.physicsBody?.dynamic = false
        craneHook.physicsBody?.categoryBitMask = UInt32(self.obstacleCategory)
        craneHook.physicsBody?.contactTestBitMask = UInt32(self.heroCategory) | UInt32(self.obstacleCategory)
        vertical.addChild(craneHook)
        
        let craneScoreContact = SKNode()

        addChild(coin)
    }
    
    // MARK: - MENU SCREENS
    // [Sam]
    
    func playBackgroundMusic(filename: String) {
