The Games: Video Games: Action: (Massive Multiplayer Online Action )

This section lists primarily Action games that may only be played online with or against hundreds of other players. This section does not list games that have both single and multiplayer options. It does not list browser based games played over the internet, or MUDs. Massive Multiplayer Online Action Video Games Games.

A massively multiplayer online game ( MMOG or MMO ) is an online game which is capable of supporting large numbers of players simultaneously in the same instance (or world). (wikipedia)