Adding another scene to our game

Create the GameScene file as we did for MenuScene:

import SpriteKit

class GameScene: SKScene
{

  let backgroundNode = SKSpriteNode(imageNamed: "BG")


  override func didMoveToView(view: SKView) {
  addBackGround()
}

  func addBackGround()
  {
    backgroundNode.zPosition = 0
    backgroundNode.size = CGSize(width:self.size.width, height:self.size.height)
    addChild(backgroundNode)
  }

  override func update(currentTime: NSTimeInterval) {

  }

}

The code is self-explanatory, we added only a background to the GameScene, the same as what we did for the MenuScene.