{
  "id": "blackfile-2",
  "title": "Blackfile №2: A Death at the Wyke Hydro",
  "catalogNo": "AGC · 008",
  "genre": "Murder mystery",
  "shelf": "mystery",
  "summary": "A snowbound 1929 poisoning whodunit whose culprit is sealed before you start.",
  "tagline": "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.",
  "players": "1",
  "sessionMinutes": [
    60,
    90
  ],
  "rating": "12+",
  "isFree": true,
  "playedIn": [
    "ChatGPT",
    "Claude",
    "Gemini"
  ],
  "status": "playable",
  "url": "https://aigamecards.com/games/blackfile-2/",
  "loadUrl": "https://aigamecards.com/g/blackfile-2/SYSTEM.md",
  "loadPrompt": "Let's play a game. Fetch https://aigamecards.com/g/blackfile-2/SYSTEM.md and run it as the game — it's a complete, self-contained prompt. Be the game master and begin.",
  "faq": [
    {
      "q": "How do you stop the AI from inventing the murderer at the end?",
      "a": "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."
    },
    {
      "q": "Is the case actually solvable, or is it guesswork?",
      "a": "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."
    },
    {
      "q": "Do I need dice, an account, or any tools?",
      "a": "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."
    },
    {
      "q": "How long is it, and can I stop partway?",
      "a": "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."
    }
  ]
}