In the era of "fragment," the predecessor to the game, "The World," fields were created by the "10 Character Free Entry." This was all the Aphabits A-Z and 0-9 which would make the total number of worlds you could go to be 3,656,158,440,062,976 per server. Then the change to the three words when it become "The World" and there is a big difference in how many fields you can access.
"The World has been upgraded numerous times, and with each version upgrade, several fuctions have been added or limited. The Official version upgrades anounced from CC Corporation are the following:
2006 "Fragment" ver. A-01
2007 "Fragment" ver. B-02
2007 (end) "The World" ver. 1.00
2008 "The World" ver. 1.40
2009 "The World" ver. 1.81 (.Hack//Sign?)
2010 "The world" ver. 2.01 (Game & OVA?)
