Pufftop (Tenkai, Sky World in Japan) is a kingdom in the sky in which Starfy, Starly, and Moe reside. It is magically floating over the ocean, and is lead by Starfy and Starly's parents the king (Papa Star) and queen (Mama Star). It is also the final stage in Densetsu no Starfy and the eighth stage in Densetsu no Starfy 2. Many of Starfy's grand adventures begin here.
In The Legendary Starfy it is the ninth stage and is unlocked only after beating the main game. Players can discover Pufftop guard clothing for Starfy and Starly that will appear on the Nintendo DS's top screen when pausing on a level. If the player has both pieces of clothing, they will unlock a Special called "Pufftop Guard" in which Starfy or Starly will run around a small Pufftop replica while in their guard suit.
Konk, the first secret boss of the The Legendary Starfy is actually a recurring character and enemy/rival of Starfy in the Legendary Starfy series who has acted as the first boss in every Japan-only game.
During the year 2000, Densetsu no Starfy was planned to be released for Game Boy Color but the game was re-built for the Game Boy Advance, with a few differences. Known differences in the gameplay of the Nintendo Space World 2000 trial demo include "Kyorosuke" originally being called "Kyororon", the inclusion of a working debug menu, the apparent lack of the Extra! screen and a different design for doors.
The costume was one of the winning designs of the Wanted Kisekae contest, a contest where people would send in their designs for Stuff to Nintendo's headquarters, with a chance of the designs appearing in the final game in some way, either as one of the actual Specials or in the Staff Roll 1. "Princess and Umbrella" was designed by Eriko Kawashima.