Kingdom Hearts/Halloween Town

Halloween Town is a world based on Tim Burton's classic stop-motion film The Nightmare Before Christmas. Similar to Atlantica, Sora's, Donald's, and Goofy's appearances change based on the environment - Sora becomes a vampire, Donald becomes a mummy, and Goofy becomes Frankenstein.

Making a Heart
From where you begin, go forward to Guillotine Square. Pass the Heartless positioned in front of you and jump up a level. Go around to your right for a cutscene, where you'll be able to see Jack Skellington, who says he's going to talk to the doctor. Keep going to come across a door marked Lab Entryway. Go up the stairs to enter the Research Lab. After a cutscene, you'll see that Jack Skellington wants to make a heart for the Heartless so he can make them dance. Sora, seeing no harm in this, decides to help. After the heart fails, the doctor suggests finding Sally, who has memory. After the cutscene, you will get your next mission (find Sally) and also a new optional party member, Jack himself.

You can now leave the Lab and go back to Guillotine Square to begin your next mission, but not before you're stopped by the Mayor for a cutscene.

Necessary Ingredients
Predictably enough, the Heartless have gotten out of control. Instead of ignoring them, you'll now have to fight them. Your next destination will be up a set of stairs leading to a gate. The gate should be labeled Graveyard. Here, after taking care of the Heartless, you'll find both Zero (Jack's loyal pet ghost-dog) and Sally, the person you were in search of. After this cutscene, you'll get what you needed (Forget-Me-Not). Now go back to the lab and talk to the doctor. After taking Forget-Me-Not, he'll tell you that one more ingredient is needed - Surprise - and that the Mayor should know where it is. Now leave the lab and go back to the Graveyard. Jump on top of the coffin at the end of the Graveyard and Examine (psx: Up lstick and psx: X). This will take you to a new location, where you'll find the Mayor. Now will be a small mini-game-esque sequence in which you'll have to Examine the tombstones in the order the ghosts appear. Now he'll tell you to look at the pumpkin, which is a large orange platform across from him. Atop it will be a treasure chest. Open it to obtain Jack-in-the-Box. Now go back to the coffin you came from (it's hiding behind the pumpkin) and Examine it to go back to the Graveyard you were in before. Go back to the Research Lab and talk to the doctor once again. A cutscene will follow where Lock, Shock, and Barrel steal the heart for their boss, Oogie Boogie. Your next task will be to get it back.