Sealed Mystery
Blackfile №2: A Death at the Wyke Hydro
A speculator dies beside his nightcap in a snowbound spa hotel; the culprit is sealed before you start, and the AI cannot change the answer.
- Players
- 1
- Length
- 75–105 min
- Rated
- 12+
- Version
- 2.0.0
- Updated
Works with ChatGPT · Claude · Gemini. Free, no signup.
Opens ChatGPT or Claude with the play prompt ready; press send if it hasn't started. Same link on your phone as on your desktop. Another app? Copy the play prompt into it, or, if it can't open links, copy the full game card below. What works where.
No web access, or want it as an installed app?
The game card is the entire game, about 13k characters: every scene and rule, and the answers the AI referees from. Paste it into an assistant that can't open links, without reading it first: it gives the game away. The Skill installs Blackfile №2: A Death at the Wyke Hydro into Claude on any plan: download it, then turn on code execution under Settings → Capabilities and add it at Customize → Skills → + → Upload a skill.
Blackfile №2: A Death at the Wyke Hydro is a snowbound 1929 poisoning whodunit: six suspects, one cup of hot milk, and an answer sealed before you start. Solo, 75–105 min a run, free to play inside ChatGPT, Claude, or Gemini. No signup and nothing to install: open it in your assistant, paste the play prompt into another, or paste the whole card where links don't open.
How to start
- Open it in your AI. Tap Open in ChatGPT or Open in Claude, and press send, or paste the play prompt into any assistant that can open links. No paid plan required.
- The game loads. The case file carries the seal, a SHA-256 hash of the solution published before release, and opens on the Wyke Hydro the night Gerald Vane died.
- Investigate. Question the six snowbound suspects, search the rooms, and follow the poison back from the cup.
- Accuse and verify. Say "I accuse" and name who you hold responsible, how and why. The AI then reads out the sealed solution; paste the revealed answer into aigamecards.com/verify, which recomputes the hash in your browser.
Questions
- How do you stop the AI from inventing the murderer at the end?
- Who killed Vane, how, and why were written out and hashed with SHA-256 before the card shipped, and that hash is printed in the case file. The AI can only reason from that fixed text — it cannot decide the answer is whoever you happen to suspect at hour two — and when you accuse, you can hash the reveal yourself and watch it match.
- Is the case actually solvable, or is it guesswork?
- It is solvable by deduction. Every clue the answer rests on can be found in the house, and each innocent suspect is cleared on at least two independent grounds. Find the evidence, test what it really shows, and the answer is fixed.
- Do I need dice, an account, or any tools?
- No dice — this case turns on deduction, not rolls — and no account beyond the chat app you already use. Open it in ChatGPT, Claude or Gemini and the Hydro opens on the night Vane died. Checking the seal afterwards takes the free checker at aigamecards.com/verify, which runs in your browser.
- How long is it, and can I stop partway?
- About seventy-five minutes if you go straight at it, closer to two hours 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.
- How is this different from Blackfile №1?
- Different house, different crime, different shape of proof. №1 is a disappearance from a bolted conservatory in a 1925 country house, with no body and no way out; №2 is a poisoning in a 1929 spa hotel, with six suspects the blizzard has shut in and a cup of hot milk at the centre of it. Play them in either order — they share nothing but the seal.
12+ — a poisoning, and a reference to a suicide in the backstory.