Find out which franchises should go massively multiplayer. To be clear, an MMO is an online game with a persistent game world. That means, even if you stop playing, the world continues to exist online and evolve. IGN spread the love by embracing a breadth of genres and avoided creating any more fantasy MMOs (sorry Fable!) in order to breathe new life into the growing MMO space. It isn't enough for a franchise to be popular; it has to be made better by offering a massively multiplayer online experience.