ドラゴンクエスト ダイの大冒険 -魂の絆- is a free iPhone game developed by SQUARE ENIX Co. Ltd. It is a new RPG that allows players to experience the story of the popular manga and anime series, "Dragon Quest: The Adventure of Dai," in a 3D animation format.

The game features a dynamic 3-lane battle system that is both simple to use and deep in strategy. Players can take on enemies by defeating them and pushing forward. The game also includes a "Break" mechanic, where attacking bosses against walls deals massive damage. Players can unleash powerful skills such as "Avan Strash" and "Mera Zoma" to turn the tide of battle.

In addition to the original story mode, which follows the events of the manga, there is also an original story mode called "Journey of Bonds." Players can travel between two worlds, strengthen their bonds with allies, and protect the world from evil forces. The game also allows players to customize their character's appearance and choose from various job classes.

Overall, ドラゴンクエスト ダイの大冒険 -魂の絆- offers an exciting RPG experience for fans of the manga and anime series. With its engaging battle system, compelling story, and character customization options, it provides hours of entertainment for players.