In addition to including around 150 puzzles, Layton’s Mystery Journey: Katrielle and the Millionaires’ Conspiracy will have free daily puzzles for the first year, following release. This means after a year there will be around 500 total puzzles, meaning it will have the most puzzles in the series history.
Sadly, the puzzles were not detailed, but this is a huge bonus for fans. Especially anyone who wants to be the first to solve a puzzle or not have them ruined. Even if you pick up the game, months after release, there will still be new problems to solve and content to explore.