Gamebook DS - Koukaku no Regios (Japan): ゲームブックDS 鋼殻のレギオス is a role-playing game for the Nintendo DS, developed by Idea Factory and released in Japan in 2009. In this game, players take on the role of a young protagonist in a steampunk world, where they must protect the city of Regios from a mysterious force known as the 'Limes'. The game features a unique combination of turn-based combat and adventure elements, with players exploring the world and engaging in battles to protect the city. Players can also customize their character's stats and equipment, allowing them to tailor their experience to their own playstyle. With a variety of enemies to fight, and a captivating story, Gamebook DS - Koukaku no Regios offers an exciting and immersive experience for RPG fans.