program SceneDemo {
  var counter: int = 0

  handler Boot phase Start {
    counter = 0
    print(1000)
  }

  scene Title start {
    on enter { print(1) }
    on exit  { print(2) }
    layer Main {
      handler Tick phase Update {
        counter += 1
        print(100 + counter)
        if counter >= 2 { become Play }        # hand off to Play
      }
    }
  }

  scene Play {
    on enter {
      print(3)
      counter = 0
    }
    on exit { print(4) }
    layer World {
      handler Step phase Update {
        counter += 1
        print(200 + counter)
        if counter >= 2 { quit() }
      }
    }
    layer Hud {
      handler DrawHud phase Render { print(900) }
    }
  }
}