The barrier which separated the worlds were not broken until the arrival heartless. The barriers disappeared or shattered and actually turned into the gummi pieces used to travel from world to world. Otherwise there is no way to get to another world. Obviously in BBS something else has happened.
I predict that somehow the Heartless did not actually start to devour worlds until the end of the events in BBS. This would mean that Kingdom Hearts was unlocked to let the darkness out on the otherside. This fits with the idea of the culminating events of BBS.
But somehow Terra and the others are capable of traveling between worlds and there haven't been any talk of Gummi Ships being in the game. Is it possible they can use the Door To Light?
What do you think about traveling in BBS?
Also
What do you think about the events that happen 10 years prior which lead to Sora's adventure.
I predict that somehow the Heartless did not actually start to devour worlds until the end of the events in BBS. This would mean that Kingdom Hearts was unlocked to let the darkness out on the otherside. This fits with the idea of the culminating events of BBS.
But somehow Terra and the others are capable of traveling between worlds and there haven't been any talk of Gummi Ships being in the game. Is it possible they can use the Door To Light?
What do you think about traveling in BBS?
Also
What do you think about the events that happen 10 years prior which lead to Sora's adventure.