History VideoGame / LaytonsMysteryJourneyKatrielleAndTheMillionairesConspiracy

* TrailersAlwaysLie: All the promotional material for the game suggests that there will be [[spoiler: an overarching arc of Katrielle searching for her father, while his disappearance is really only mentioned in a few cutscenes and Kat is only seen searching for him in the intro.]]

The game was released worldwide on iOS and Android on the 20th of July, 2017, with the 3DS version being released in Japan on the same date. The 3DS version was released internationally on October 6, 2017. The Nintendo Switch "Deluxe Edition" version was released in Japan on August 9th, 2018, and in North America on November 8, 2019. A "Deluxe Edition Plus" is also set to release in Japan on July 8th, 2021, with the option to switch between the original voice actors for the game and the ones in the anime.

The game was released worldwide on iOS and Android on the 20th of July, 2017, with the 3DS version being released in Japan on the same date. The 3DS version was released internationally on October 6, 2017. The Nintendo Switch version was released in Japan on August 9th, 2018, and in North America on November 8, 2019.

It received an anime adaptation as ''Anime/LaytonMysteryDetectiveAgency: Kat's Mystery-Solving Files'' in April 2018.

* BigWhat: Said by Ernst and Sherl after Kat says the WhamLine in a post-credits scene.

* HurricaneOfPuns: Any time Sherl gets on a roll with his dog puns. He calls criminals "mongrels" and young people "pups". He also refers to Kat as a... well, cat.

* HeWentThatWay: The Lipski brothers [[spoiler:When Kat is fleeing the police after a false murder accusation]].

* GettingCrapPastTheRadar:
** There's a whole section in case three regarding poop as a motive for a crime. A lot of toilet humor ensues.
** Sherl calls one of the people the group encounters "a real swinger", before clarifying he means a ''mood'' swinger; not the other kind.
** When it's being discussed that [[spoiler:Ernest's apparent crime]] will be in the newspaper, Katrielle says it'll probably be page three news at most. Ernest laments that he doesn't have the figure for [[https://en.wikipedia.org/wiki/Page_3 page three]].

* RealityIsUnrealistic: One of Katrielle's catchphrases is "the truth is stranger then fiction", and her crime-solving abilities are considered miraculous for the fact that she actually realizes these bizarre truths when other people wouldn't even consider them. Truths that Katrielle arrive at include [[spoiler:Big Ben's hour hand being made of wafer, a bird being the culprit because it ate too much and did a massive poo, and an apparent "bank heist" actually being a freak accident caused by a malfunctioning ventilation. And she's always right.]]

** [[spoiler:Douglas Dert seems like a prime candidate for Ratman's true identity in case 07: he's a reporter for the London Times who seems to pop up everywhere you go, and is always the one writing articles on Ratman. It's a pretty familiar set up to anyone familiar with superheros, like Superman and Spider-Man. There's even a few times where he'll begin to rhythm, which is one of Ratman's traits. He isn't Ratman, but someone else connected to the London Times ''is''.]]

** The biggest difference between Ernest and Clive is that Ernest is almost entirely none-subjectively a likeable and sympathetic character, which is helped largely by his extremely focused revenge scheme that would've resulted in damage only to those he has beef with. Whereas people's sympathy towards Clive tends to vary far more, given his scheme for revenge was a ''lot'' more diabolical and specifically targeted innocent people. This is also why no charges were pressed against Ernest, who at most committed a few crimes like coercion, blackmail, and possibly even a few more serious charges, if you really wanna stretch what Ernest did, whereas charges ''were'' pressed against Clive because he literally committed a large scale terrorist attack on London.

** Another returning NPC is Benny, the popono seller from ''Azran Legacy''; having traveled to London to try and market his poponos internationally.

** Several of the collectible trinkets you can find reference previous games: The "Magnificent Moustache" refers to "slicked-back hair and a pink shirt" in a reference to Aldus from the prequel games. There's a popono from San Grio and a snow globe from Froenborg in ''Azran Legacy''. A music box appears to have figures of Anton and Sophia from ''Diabolical Box''. The "Lovable Lake-Dweller" plushie is based on ''Last Specter''. And one last item is a scale model Laytonmobile.

The game was released worldwide on iOS and Android on the 20th of July, 2017, with the 3DS version being released in Japan on the same date. The 3DS version was released internationally on October 6, 2017. The Nintendo Switch version was released in Japan on August 9th, 2018; no international release date has been confirmed.

The game was released worldwide on iOS and Android on the 20th of July, 2017, with the 3DS version being released in Japan on the same date. The 3DS version was released internationally on October 6, 2017. The Nintendo Switch version will be released in Japan on August 9th, 2018.

* ClearMyName: Case 11: "Katrielle Layton: WANTED!" has Katrielle accused of murder by Chief Inspector Royall Britannias. [[spoiler: The "murder victim," Ms. Pryce, had died from a fatal blow to the head by the mannequin head she was trying to fetch down from a cabinet when gravity caused it to strike her without aid from anyone else. Only after he failed to revive Ms. Pryce did the Chief Inspector, then driven by Envy, concoct a scheme to frame Katrielle for murdering Ms. Pryce, and discredit Inspector Hastings, who had benefited from Katrielle's puzzle solving by painting HIM "who solicits the help of criminals at the same time." As Hastings HAD been helped by Katrielle, the Chief Inspector had been "losing ground" and feared if his job was taken from him, that he'd be a failure again (which given he was born with nothing and losing what he'd had now was his greatest fear).]]#

** Considering that Case 10's prime suspect is [[spoiler: Ernest]], it's only fitting that the title pay tribute to one of [[Creator/OscarWilde Oscar Wilde's]] [[Theatre/TheImportanceOfBeingEarnest most beloved plays]]. And (WARNING: MAJOR SPOILER!) [[spoiler: the allusion does not end there: like in the play, Ernest isn't his real name.]]

NeedsWikiMagicLove.

** Considering that Case 10's prime suspect is [[spoiler: Ernest]], it's only fitting that the title pay tribute to one of [[Creator/OscarWilde Oscar Wilde's]] [[Theatre/TheImportanceOfBeingEarnest most beloved plays]]. And (WARNING: MAJOR SPOILER!) [[spoiler: even more fitting, since, like in the play, Ernest isn't his real name.]]

** Considering that Case 10's prime suspect is [[spoiler: Ernest]], it's only fitting that the title pay tribute to one of [[Creator/OscarWilde Oscar Wilde's]] [[Theatre/TheImportanceOfBeingEarnest most beloved plays]].

It received an anime adaptation as ''Layton Mystery Detective Agency: Kat's Mystery-Solving Files'' in April 2018.

The game was released worldwide on iOS and Android on the 20th of July, 2017, with the 3DS version being released in Japan on the same date. The 3DS version was released internationally on October 6, 2017.

* TakeYourTime: No matter how urgent the case is, you can still find a hidden puzzles and Hint Coins.

* EasilyForgiven Almost every culprit is this. Mostly justified that [[WhiteandGreyMorality they are redeemable]], although how justified it may varies from case to case based on any particular player.

* LighterAndSofter: Compare to her father's series, Katrielle's cases are less violence involved.

* ThePromise: In the final case: [[spoiler: Miles promised his mother he'd be big and strong and important as the people who stole the diamonds from the Richmond family. He then became Ernest and later Lord Adamas.]]

* RealityIsUnrealistic: One of Katrielle's catchphrases is "the truth is stranger then fiction", and her crime-solving abilities are considered miraculous for the fact that she actually realizes these bizarre truths when other people wouldn't even consider them. Truths that Katrielle arrive at include [[Big Ben's hour hand being made of wafer, a bird being the culprit because it ate too much and did a massive poo, and an apparent "bank heist" actually being a freak accident caused by a malfunctioning ventilation. And she's always right.]]

* ClearMyName: Case 11: "Katrielle Layton: WANTED!" has Katrielle accused of murder by Chief Inspector Royall Britannias. [[spoiler: The "murder victim," Ms. Pryce, had died from a fatal blow to the head by the mannequin head she was trying to fetch down from a cabinet when gravity caused it to strike her without aid from anyone else. Only after he failed to revive Ms. Pryce did the Chief Inspector, then driven by Envy, concoct a scheme to frame Katrielle for murdering Ms. Pryce, and discredit Inspector Hastings, who had benefited from Katrielle's puzzle solving by painting HIM "who solicits the help of criminals at the same time." As Hastings HAD been helped by Katrielle, the Chief Inspector had been "losing ground" and feared if his job was taken from him, that he'd be a failure again (which given he was born with nothing and losing what he'd had now was his greatest fear).]]

* EasilyForgiven Almost every culprit is this. Justified that [[WhiteandGreyMorality they are redeemable]].
** The closest thing to an exception is case 08, which [[spoiler: Captain Midas and co.]] are still arrested after attempting to steal a golden statue. Even then, Fullhold still forgives him and allows him to [[spoiler: captain his old ship again]] once he's released.

** [[spoiler: In case 11 Katrielle & Sherl are almost crushed after the giant ball of the Bowlyn statue comes loose just after they reach the resolve to undercover the truth of Ms. Pryce's murder. They speculate, and quickly discard, that it may have been the police's doing[[note:Katrielle is on the run from them due to being the prime murder suspect]], whereas players are likely to assume it was the culprit. Turns out it was ''no one's'' doing, it just happened to come loose. The actual culprit is one too, as he is made out through the case like he is an obvious villainous culprit. While he did indeed try and disguise the Ms. Pryce's death as a murder to frame Katrielle, he didn't kill her, and actually tried to ''help'' her.]]