In Japan, Dynasty Warriors 2 was released under the name of "真・三國無双" (Shin Sangoku Musou) instead of "真-三國無双2" (Sangoku Musou 2). This was done so that it could be differentiated from the original Dynasty Warriors, since the two were different genres of games. Because of this, the Dynasty Warriors games are one number off between Japan and North America.
Contributed by Kitsune Hawk