Did you beat Neverland?
If so, then go and talk to Cid in Traverse Town.
I did I beat all the worlds but theres 1 world i cant get in
(and I beat Neverland, Halloween town, monstro, Alnatica, Traverse Town, Wonderland, Coliseum,Jungle (as i call it), Agrabah, and I think theres a couple i didnt say but I be em could you help me?