Murder Mystery Game

1. The solution comes first. The culprit, the murder room and the window are chosen before a single clue exists, and every clue is derived from that structure. Nothing in the case is written by a model, so nothing in it can be arbitrary.
2. Then it is proved. Thirteen checks run before you are shown anything. With all the evidence, exactly one suspect must survive the alibis and it must be the culprit. Every clue must be reachable through its prerequisites from the opening scene. The free evidence alone must still bring the field down to two names with a crack already showing.
3. A failing case is discarded. It is regenerated from the next seed and checked again. You are never handed a case that cannot be solved by reasoning.
4. The page owns the truth, not the model. Who did it, which clues you hold, what each suspect claims — all of it lives here. The model is given the public case and a private briefing for the one person it is currently playing, and it is never told who is guilty except while it is playing them.
5. A suspect who contradicts the file is refused. Rewriting an alibi, confessing without cause, or inventing a sixth person gets the answer thrown away and asked again — not narrated with a warning attached.

Five settings — a snowed-in country house, a night train, a theatre after curtain, a winter observatory and an ocean liner — and five invented suspects per case, each with a stated alibi and something to hide. You question them in plain English; they answer in character and concede only what the case allows. The results of all thirteen fairness checks are shown to the player on the case itself, and a free in-browser auditor watches every answer for invented people, rewritten alibis, unearned confessions and cross-claims.

Every turn restates the whole case inside a fixed character budget, so a long investigation cannot lose an early answer, and sessions are rotated at thirty questions so one never meets the message cap. Case codes are shareable: the same code rebuilds the same case, culprit included. Investigations are saved to your account and are resumable on another device. The verdict distinguishes a solved case from a lucky guess and tells you which you got, and you can export the notebook as Markdown, the clue table as CSV and the whole case as JSON.

The recording ships with the page and replays through the real renderers — the board, the notebook, the auditor and the verdict — with no account and no credits. Opening a case is free too: generating it, reading the case file, and searching every room and every object are all done here in the page and never call the model. Questioning a suspect is the part that costs.