If there is one thing that the Kingdom Hearts series is known for, it is the numerous Disney Worlds that you visit. That, and perhaps the never-ending pile of keyblades that get shown. Every entry in the series has had multiple Disney worlds for you to visit, and each of these worlds typically has a problem that you need to help the protagonists of the world solve. Needless to say, Kingdom Hearts 3 is the same way, though it has noticeably fewer Disney worlds.