Edogawa Ranpo no Kaijin Nijuu Mensou DS (江戸川乱歩の怪人二重面相DS) is a Nintendo DS game released in Japan in 2008. It is based on the popular mystery novels of the same name by Japanese author Edogawa Ranpo. Players take the role of the protagonist, Detective Kogoro Akechi, as he investigates a series of mysterious incidents occurring around Tokyo. The game features a unique combination of adventure and action elements, as players investigate clues, interrogate suspects, and battle villains using a variety of weapons. The game also includes a variety of mini-games, such as a card game and a quiz game. The game is set in a 3D environment, and features detailed 3D models of characters and locations from the novels. The game also features full voice acting for all of the main characters. Edogawa Ranpo no Kaijin Nijuu Mensou DS is a unique and exciting game that is sure to please fans of Ranpo’s novels, as well as any fan of mystery and detective games.