.Hack Series

The World R:2
Due to a fire in CC corporation headquarters a year following .hack//Legend of the Twilight, CC corporation had made a new version of the game called The World Revision:2 or simply as "The World R:2". The World R:2 offers new locations and old ones that are hidden within the game, these locations are commonly known as the lost grounds. There are many character classes, new and old. PKing (player killing) has become very popular in The World R:2 and due to this uprising, a guild called "Moon Tree" has been created against PKing. The leader of Moon Tree, Zelkova, is an expert hacker and created a place for hackers called "Net Slums".

The World R:X
The World Revision:X (or simply as "The World R:X") is a new portable version of The World created three years after the world R:2 was made. The World's fictional in-game setting is set a thousand years after the original version.