Kingdom Hearts II Erm... a lil help?

I just completed the 1000 heartless thing and started working on Atlantica (the 5 drive gauge advancement) but now I am out in the world I have noticed Agrabah and some other world have a bubble around them, I completed the first part of Agrabah but never went to Halloween town when I unlocked it (I only unlocked it because I love the gummi ship missions), do those worlds get unlocked again at any point? I had intended to 100% the game.

 

I did that my very first time playing through the game. Don't worry, just continue through the worlds you can enter and eventually you'll get to halloween town and such. You'll just do the first episode and it'll be a higher level than normal, and you immediately can go to the next episode right after.

 

Thanks man I appreciate it, I thought for a while there that I was going to have to start over... and I have already invested 44 hours in this playthrough so far lol.