Just passed it and the worlds change after that, I forgot to visit Halloween town so I was curious what happened. It dissapeared off of the world map, so I am kinda worried that its just gone.
In Kingdom Hearts 2, what happens if you forget to visit a world before the 1000 heartless challenge.?
It's disappeared temporarily. It will come back and you can finish it off then, don't worry.
In Kingdom Hearts 2, what happens if you forget to visit a world before the 1000 heartless challenge.?
It will reappear eventually. Just continue the game.
