If you played the other versions other than the gameboy one your missing out on Kain, Yang, Edward, and Edge. In the game boy version you can get the 50 floor dungeon after you beat the game and once you beat Kain, Yang, Edward, and Edge lunar bosses each character gets a new ability that replaces the old one for example:Edge gains the ability to plunder instead of steal>once you equip the equipment the boss dropped.

Da point: Kain can double jump by equiping the dragoon gloves.yup