 It was the first game in the series to use 3D graphics; according to Nakamura, they had aimed to evolve the series dramatically by introducing this 3D engine, which allowed for free roaming and open environments.They focused on creating original features, as opposed to the simultaneously developed Game Boy Color game "Shiren the Wanderer GB2", for which they were forced to focus on "traditional dungeon types" due to the limitations of the Game Boy Color hardware.They considered the castle-building one of the game's main points, and developed that "core" first, before implementing dungeons.