Tantei Xeno to Nanatsu no Satsujin Misshitsu
Detective Xeno and the Seven Locked Murder Rooms

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Manga centered around detectives and mystery-solving.

aka "don't let your kid read this alone" manga, or "why the F is this Shounen?" manga.
If you can't stand gore or dangerous/extreme mental body of thought, don't try these.

I have a stack with the opposite: Seinen with little gore:
https://myanimelist.net/stacks/2036

(Also thanks to ryzxgum)

They would have gotten away with it too, If it weren't for these meddling protagonists.

A list of manga about solving a big mystery, solving individual cases that are unrelated to each other or solving individual cases which are linked to solving a bigger mystery.

The mysteries solved are either a mystery to both the protagonist and the reader or just the protagonist with the reader knowing most of what's going on, it may also be a mystery to whoever is trying to solve the mystery which could be supporting characters or the protagonists antagonist.

For the badge-based item entries in the yearly Manga Reading Challenge. As there is an entire decade's worth of MRC events with a myriad of badges provided by various talented artists, this will be a multipart stack. All series are marked with their respective first badge year.

Note: If you don't see a title from a specific badge in a given year here, it's either in a previous part or I failed to find the source for it. My apologies if it's the latter.

MRC 2022 badges: https://myanimelist.net/forum/?goto=post&topicid=1984344&id=65388337
MRC 2023 badges: https://myanimelist.net/forum/?goto=post&topicid=2070198&id=68389967

Stack series Pt 1: https://myanimelist.net/stacks/63297
Stack series Pt 2: https://myanimelist.net/stacks/63302
Stack series Pt 3: https://myanimelist.net/stacks/63350
Stack series Pt 4: https://myanimelist.net/stacks/63351
Stack series Pt 5: https://myanimelist.net/stacks/63388
Stack series Pt 6: https://myanimelist.net/stacks/63459
Series stack Pt 8: https://myanimelist.net/stacks/63501
Series stack Pt 9: https://myanimelist.net/stacks/63502
Series stack part 10: https://myanimelist.net/stacks/63504