Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy

Join Katrielle Layton, our new hero, as she becomes embroiled in a casual, quizzical quest, which has its roots in our hero’s search for her missing father, Professor Hershel Layton. You'll be whisked around…

68 20 July 2017 ESRB E10+

Adventure Puzzle Role-playing (RPG) Strategy Fantasy Mystery

Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy is an adventure developed by LEVEL-5, released 20 July 2017 on Nintendo 3DS, Android and iOS. The main story takes about 26.5 hrs to finish.

Verified 18 Oct 2026 Sources: IGDB , Wikipedia

What Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy is

Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy is an adventure game developed by LEVEL-5 and released in 2017. It is available on Nintendo 3DS, Android and iOS. It carries an ESRB E10+ age rating.

The premise, in the publisher's words

Join Katrielle Layton, our new hero, as she becomes embroiled in a casual, quizzical quest, which has its roots in our hero’s search for her missing father, Professor Hershel Layton. You'll be whisked around London's famous landmarks, from the Houses of Parliament to Tower Bridge, following Kat, solving case after unlikely case, until she unwittingly uncovers the Millionaires' Conspiracy. The story begins with Katrielle setting up the Layton Detective Agency, determined to prove her worth and hoping the exposure will uncover clues about the missing professor's whereabouts. Help Kat discover clues, solve mysteries and original puzzles! Fashion-conscious players can also redecorate the agency…

Description from the publisher · source

How it plays

It is played from a side view perspective. Its themes are fantasy and mystery. It is a single-player game with no multiplayer component.

Where it sits in the Professor Layton series

Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy is the ninth of 12 entries we hold in the Professor Layton series. It arrived 4 years after Professor Layton and the Azran Legacy. The next entry was Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy - Deluxe Edition in 2019. Its critic score of 68 is 16 points below the series average of 84. The highest-rated entry is Professor Layton and the Unwound Future at 93.

See all 12 Professor Layton games in release order →

How it was received

Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy holds a critic score of 68 out of 100. That places it above 30% of the 7,530 rated adventure games in our database, which average 72. Games released in 2017 averaged 71, so it scored 3 points below the year average.

How long it takes, and what that costs

The main story runs about 26.5 hrs.

What it launched against

Layton's Mystery Journey: Katrielle and the Millionaire's Conspiracy launched on 20 July 2017, within three weeks of Hellblade: Senua's Sacrifice, Hellblade: Senua's Sacrifice, Crash Bandicoot N. Sane Trilogy and Crash Bandicoot N. Sane Trilogy. All of them reviewed better.

Released around the same time: Hellblade: Senua's Sacrifice, Hellblade: Senua's Sacrifice, Crash Bandicoot N. Sane Trilogy, Crash Bandicoot N. Sane Trilogy.