GameManager.scala

class GameManager extends Actor {

  override def receive = {
    case CreateGame =>
      val id = GameId.createRandom
      context.actorOf(GameActor.props(id), id.value)
      sender() ! GameCreated(id)
    case SendCommand(gameId, command) =>
      context.child(gameId.value) match {
        case Some(game) => game forward command
        case None => sender() ! GameDoesNotExist
      }
  }

}