Final Fantasy Crystal Chronicles is a action role-playing game released for the Nintendo GameCube and the first Final Fantasy game on a Nintendo console since Final Fantasy VI. In the time of Crystal Chronicles, the world is covered in a noxious gas known as “miasma”, to which direct exposure can prove fatal. Towns, villages and other settlements throughout are protected from the ill effects of miasma by crystals, which generate a barrier which miasma cannot penetrate. [Infos from Wikipedia]
Even the players need to bring a crystal around when they explore the game’s levels: this “concept” could have been created as a motive to have all the characters in the same screen in the multiplayer mode, but maybe it was not going to be in the game initially. Infact, in these early screens and video, there is no crystals or miasma that we can see. Obviusly this video was just going to be a “presentation” of the game, a simple tech demo without all it’s final characteristics, but we can only wonder if the crystal/miasma concept was created only in mid / late development. Other changes in the beta version of Crystal Chronicles are in the character design, different camera-angles and different enemies in the cave level.