UPDATE: There are many published versions of this game, here is a brief list so that (soon or later) everyone who plan on making a game or two on this one , can.

iJJi will service: North America,Mexico,United Kingdom,Canada LINK
The9 will service China
GameOn will service Japan
And Webzen will service all regions except for: mentioned countries,Korea and Taiwan LINK

MMORPG representing the perfect balance between advantages of console package RPG and the battle system of MORPG. Users can communicate within the town to form a community and play through various economic activities. In addition, by operating a unique battle zone system, users are able to enjoy stylish combats and experience the story line.

In Soul of the Ultimate Nation’s Battle Zone System, users are able to choose a map, difficulty, number of participants, and reward type to personalize the battle and dungeon. In addition, depending on the way users choose it can differ from Mission, Hunting, PVP, and Event.

LINK to Soul of the Ultimate Nation