
Originally Posted by
Squenix
"Basically there are worlds that fell into darkness besides the ones Sora returned to normal in the first Kingdom Hearts -- some of the princesses' worlds, Dumbo's world, and so on. The original story had all these worlds get fixed up in KH1's ending, but not all of them completely returned to normal, instead lying in stasis between light and dark. Since the worlds themselves are asleep, the game is set in the dreams these worlds are having. It's Sora and Riku's job to wake these worlds up, return them to normal, and gain their Keyblade Master certification."