This is a fun little game that presents a series of 12 mysteries, and has you gather clues and deduce the details of what went down in each case. While the first couple cases are simplistic, it continually escalates into much more complex puzzles that are more connected than they initially appear. By the end of the game, if you haven't been taking notes, you might wish you had... but when you go back to dig up the details, it will feel nice to see past events in a new light.
The cases are cracked by first gathering key words by examining the environment and the people and objects within it. Then, you fill those key words into the blanks of some documentation provided by the game. This most commonly means a short paragraph describing the circumstances of a murder, as well as filling in details on some supplementary materials like a map or bunch of portraits of the characters.
Once you've filled in a certain set of solutions, you'll receive feedback on your answer. This can either be a straight-up "correct" or "incorrect", or a hint that only two or less things you've entered are incorrect. It's a similar design approach to Return of the Obra Dinn, and it works well here for keeping track of all the info and helping frame your understanding of the investigation. A pretty involved hint system tries to encourage you to figure things out on your own, and provides tiny nudges in the right direction if you need it.
The game really shines with misdirections that make you step back and re-examine the whole picture. I think it balances the complexity pretty well overall. It's definitely tricky, especially toward the end, but still reasonable in the scope of what it's asking you to consider. The way that knowledge from prior cases becomes increasingly relevant in the game also requires you to pay attention and adds some nice extra cohesion and engagement.
Story is a pretty interesting area of the game, with some memorable stuff both in the cases themselves and in the overarching mystery that binds it all together. By the end it goes some very unexpected places, to a point where I'd almost say it's a bit over-the-top, but in general I liked it.
The artistic direction is a bit weird—not my favorite style, but I'd say it fits the tone pretty well—some occasional animated cutscenes look rough, though. The music is a lot less spotty, though, pretty solid throughout.
This definitely has a style of its own and is consistently fun for a solid 5-6 hours or so. It is a no-brainer to pick up if you have loved a similar puzzle/detective game (like Obra Dinn).