The technology for MMOG first person shooters (MMOGFPS) is still quite challenging, although successful releases include World War II Online and Planetside.
With the strong emphasis on character interaction and group play, role-playing games easily made the transition from single player adventures to MMOG.
While nearly any genre can be deployed as an MMOG, Role Playing Games and Adventure games have proved to be some of the most popular.
Fear not, fellow MMOG enthusiast, because we've hunted down five great games for you to enjoy.
GuildWars is sometimes considered an MMOG even though players tend to work in small groups.
Of course, as with all videogame definitions, what constitutes a MMOG is somewhat vague.