Sealed Mystery
Blackfile №2: A Death at the Wyke Hydro
A speculator dies beside his nightcap in a snowbound spa hotel; the culprit was sealed before you play, and the AI cannot change the answer.
Blackfile №2: A Death at the Wyke Hydro is a free murder mystery you play inside ChatGPT, Claude, or Gemini. A snowbound 1929 poisoning whodunit whose culprit is sealed before you start. For solo play, about 1–2h a session, it needs no signup — open it in your assistant, or paste one link, and play.
- Players
- 1
- Length
- 1–2h
- Rating
- 12+
- Version
- 1.0.0
Works with ChatGPT · Claude · Gemini. Free, no signup.
Opens your assistant, fetches the game, and starts — the same on your phone or desktop. Playing in Gemini? Tap Copy link to play and paste it in.
No web access, or want it as an installed app?
The game card is the whole prompt — paste it if your assistant can't browse the web. The Skill installs Blackfile №2: A Death at the Wyke Hydro into Claude on any plan: download it, then Claude → Settings → Capabilities → Skills → Upload.
How to start
- Open your AI. Start a new chat in ChatGPT, Claude, or Gemini. No paid plan required.
- Paste the case file. The file includes the sealed hash and boots the Wyke Hydro on the night Gerald Vane died.
- Investigate. Question the six snowbound suspects, examine the rooms, and check the timeline. The AI answers only from the sealed facts.
- Accuse and verify. Name the poisoner, then hash the revealed solution to confirm it matches the seal.
Questions
- How do you stop the AI from inventing the murderer at the end?
- The full solution, culprit, method, and motive, is written before you play and locked with a SHA-256 hash printed in the case file. The AI reasons only from that fixed text, and you can hash the revealed solution yourself to confirm it never changed.
- Is the case actually solvable, or is it guesswork?
- It is solvable by deduction. Every suspect but one is cleared for the poisoning window by a witnessed alibi or a physical fact, and the remaining clues fix who had both the cup and the poison. Find the evidence, cross off the innocent, and one name is left.
- Do I need dice, an account, or any tools?
- No dice and no account beyond the chat app. Paste the case file into ChatGPT, Claude, or Gemini to begin. Verifying the seal uses any SHA-256 tool, including ones built into your operating system, and a save code lets you pause and resume.
- How long is it, and can I stop partway?
- About an hour solo, up to ninety minutes if you question everyone. Say "save" at any point to print a save code, then paste it into a fresh chat with the case file to resume exactly where you left off.
12+ — a poisoning, and a reference to a suicide in the backstory.