Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy(JP) is an adventure and puzzle game of the Professor Layton series and this series seventh main game. It features Katrielle Layton, the daughter of Professor Layton. Who solved various mysteries in London in hope of finding her missing father the famous Hershel Layton.


Private detective Katrielle Layton, daughter of the famous Professor Hershel Layton, awakens from a nightmare about her missing father, on the day of her detective agency's opening. The same day Katrielle and her assistant Ernest Greeves meet a talking dog that, for reasons unknown, cannot be understood by anyone else but them. The dog explains that he has amnesia, and that he wishes for them to solve the mystery of who he really is, and Katrielle makes up the name "Sherl O.C Kholmes" for him.


Layton's Mystery Journey follows Professor Hershel Layton's daughter, Katrielle "Kat" Layton, who solves puzzles in her father's place alongside her talking dog Sherl and her friends Emiliana Perfetti and Ernest Greeves. When her father vanishes, Katrielle goes off in search of him, coming across various puzzles and mysteries along the way. Like previous games in the series, the game features various puzzles for the player to solve using the touchscreen as they explore the environment and progress through the game's story.

Unlike previous Layton games, the game is split up into twelve distinct cases, with one overall theme, rather than one continuous story separated by chapters.


The name "Lady Layton" leaked the 26th July of 2016 due to a leaked trademark of LEVEL-5, one day before the reveal of the game, the 27th July of 2016 and the presentation of a full trailer.

The puzzles of the game will be designed by Kuniaki Iwanami, due to the passing of Akira Tago.

The official name of the game was changed from Lady Layton: The Millionaire Ariadone's Conspiracy to Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy the 4/13/2017.


The game received mixed reviews, according to review aggregator Metacritic. Shaun Musgrave of TouchArcade gave the game five out of five stars, praising the series's smooth transition to mobile platforms, the "outstanding" presentation, the story and the puzzles. Game Informer's Kyle Hilliard considered Katrielle a more enjoyable a protagonist over her father. However, he had issue with the game's narrative structure, considering the standalone nature of the cases to cause the finale to "fall flat", as well as the puzzles, which he considered to overall be mediocre, and to have some "frankly stupid solutions".

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