ロンドン迷宮譚 is a free iPhone game developed by Sumzap Inc. It is an offline version of the game that was previously available. The game is a simple and enjoyable "item search" game set in 19th century London. Players have to find hidden items within a time limit, with locations including Sherlock Holmes' room, Baker Street, and the London police. The game also features characters with special skills to assist players in their search, such as removing fog and rain to reveal hidden items.

The game offers a captivating mystery storyline written by Yosaburo Kanari, known for "Kindaichi Case Files" and "Mystery Folklorist Yakumo Yagumo." Set in 19th century London, the story follows the protagonist, Taku Makoto, as he unravels the mystery of Jack the Ripper.

In addition to the gameplay and story, players can also decorate their own "miniature garden" by acquiring various furniture items as they progress through the item search. Overall, ロンドン迷宮譚 offers an immersive and engaging experience for fans of mystery and item search games.