From the Umineko Wiki. These tie into the Umineko Truths.

These are the Rules for a Proper Mystery; all good mysteries must follow these rules in order to be 'solvable' by the audience.

The Game Masters' Riddles and the Solutions must follow these.

The Umineko DecalogueEdit

Knox's 1stEdit

It is forbidden for the culprit to be anyone not mentioned in the early part of the story.

Knox's 2ndEdit

It is forbidden for supernatural agencies to be employed as a detective technique, unless it is already part of the riddle.

Knox's 3rdEdit

It is forbidden for hidden passages to exist.

Knox's 4thEdit

It is forbidden for unknown drugs or hard to understand scientific devices to be used.

Knox's 5thEdit

(not included) It is forbidden for stereotypical minorities to assist or hinder the detective beyond providing their own conclusions and interpretations, or for said minorities to be the culprit. (possible re-interpretation of the original Knox's 5th, with the part in bold added to avoid contradicting Knox's 9th.)

Knox's 6thEdit

It is forbidden for accident or intuition to be employed as a detective technique.

Knox's 7thEdit

It is forbidden for the detective to be the culprit.

Knox's 8thEdit

It is forbidden for the case to be resolved with clues that are not presented.

Knox's 9thEdit

It is permitted for observers to let their own conclusions and interpretations be heard.

Knox's 10thEdit

It is forbidden for a character to disguise themselves as another without any clues.

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