Layton’s Mystery Journey

Layton's Mystery Journey: Katrielle and the Millionaires' Conspiracy is a puzzle game developed and published by LEVEL-5 in 2017 for Nintendo 3DS and Apple iOS. A version for Nintendo Switch was also released in Japan in 2018. The game features DLC support, however some extra content could be unlocked by participating in a promotional campaign called Layton's Mystery Journey: Real World Puzzle Solving. The content unlocked could be redeemed in-game on both 3DS and iOS by inserting codes generated by the campaign website after unlocking each additional item. The website was shut down shortly after the game's release, making them unobtainable today.