I've unlocked and sealed the keyholes to Traverse Town, Wonderland, Deep Jungle, Olympus, Halloween Town, Agrabah, Atlantica and Neverland, and I've been through Monstro. I let Cid install the gummi part on the ship after Neverland, and a new world has shown up beside Neverland, but it won't let me enter. Goofy said that I needed to go back and revisit the worlds and that I might find new items. I've been revisted the worlds, and can't seem to find anything new. How am I supposed to get into the new world?