Guild Wars

Guild Wars is an episodic series of multiplayer online role-playing games developed which has been developed by ArenaNet and published by NCsoft.

This game provides basically two modes of gameplay:  a cooperative role-playing component and a competitive player vs. player (PvP) component.  Both of these are hosted on ArenaNet's servers.

 Between April 2005 to August 2007, three stand-alone episodes and one expansion pack were released in the series.

The games depict the history of the fictional fantasy world of Tyria; each campaign focuses on events in disjoint sections of the world at roughly the same time.