Whatever culture shock there might have been initially soon subsided, as Kingdom Hearts would go on to spawn a pair of sequels -- Kingdom Hearts: Chain of Memories for the Game Boy Advance and Kingdom Hearts II for the PS2 -- as well as a toy line and a series of manga comic books. Both of the aforementioned games continue Sora's adventures, and while it really isn't possible to get into plot details without revealing spoilers, they include many twists and turns and introduce gamers to new allies and enemies alike. They also expand the Disney influence to include content from such fan favorites as Tron and Pirates of the Caribbean.
In terms of gameplay, both sequels differ from their predecessor, and from each other. Chain of Memories features a real-time, card-based battle system, while Kingdom Hearts II improves upon the original's combat engine with multiple additions, such as the use of the triangle button to trigger special in-battle events. Also, the second game features several new minigames, and while both Kingdom Hearts I & II feature space-shooter segments featuring Sora and company's spacecraft, it is much deeper, more user friendly, and more enjoyable in the latter game than in the former. Overall, though, neither of the follow-up titles is quite as good as the original Kingdom Hearts, but the PlayStation 2 sequel is far closer in quality than the sub-par GBA offering.