alot of people (on message boards and site I have visted) claim to believe Zell to be Tifa Lockhart and Cloud Strifes child,or grandshild.This would mean that ff7 and ff8 took place in the same world. Over 2 generations,I dont believe that everything could change so much as it did.Besides that, FF7 would seem like a game that should come after ff8,despite the order of release.

FfX and FFx-2 def. were in the same world.Go figure.

IX could possibly be the same world as that of 7 or 8, because of the time diffrance(medevil to scifi).Is this likely?Probly not.

FF: CC could have been the same world as IX,but hightly unlikely.

all the games I have played.they are diffrent worlds I believe,despite any hints,things we assume, and other such evidence (like the biggs and wedge in every game,or mentioning Soldier) that we may pick up on.They were made by the same company,and I believe that things like Soldier being mentioned are merely there to excite fans.Not in the same worlds.