Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy[a] is a puzzle video game developed by Level-5 for Nintendo 3DS, iOS, and Android. It is the seventh main entry in the Professor Layton series and follows a new protagonist, Katrielle Layton, who searches for her missing father Professor Hershel Layton. The smartphone versions of the game was released worldwide in July 2017; the Nintendo 3DS version was released in Japan on the same date, and was released in Europe, North America and Australia on October 6, 2017. Source: Wikipedia, "[en.wikipedia.org/wiki/Layton%27s_Mystery_Journey Layton's Mystery Journey]", available under the CC-BY-SA License.