# Gemini3-Hackathon-Mystery-Game

- **Event:** [Gemini 3 ハッカソン 東京](https://cerebralvalley.ai/e/gemini-3-tokyo-hackathon)
- **When:** Sat, Feb 21 at 9:00 AM – 10:00 PM (GMT+9)
- **Where:** 東京都渋谷区渋谷 3 丁目 21 - 3 渋谷ストリーム 5F
- **Team:** [Kota Kawagoe](https://cerebralvalley.ai/u/kota-kawa)
- **GitHub:** https://github.com/kota-kawa/Gemini3-Hackathon-Mystery-Game
- **Demo video:** https://youtu.be/OxLgLiP3KQ8
- **Gallery:** https://cerebralvalley.ai/e/gemini-3-tokyo-hackathon/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gemini-3-tokyo-hackathon/hackathon/gallery/36

Locked-Room Mystery is an AI-native detective game where Google Gemini serves as the Game Master (GM), generating and running unique cases in real time.

Core Features
Dynamic Generation: Gemini creates a fresh JSON case file (suspects, killer, trick, motive, evidence) and a matching anime-style background image for every playthrough.

AI Game Master: Answers the player's freeform questions dynamically. Designated lying NPCs maintain coherent false testimony throughout the interrogation.

Contradiction Guard: A secondary AI call cross-checks GM responses against the hidden case data, rewriting inconsistencies to ensure a fair, solvable mystery.

Scoring & Feedback: Evaluates final accusations (S/A/B/C rank), highlights logical weaknesses, reveals the truth, and generates a dynamic result screen image reflecting the score's mood.

Conversation Summarizer: Distills the Q&A history into a structured deduction sheet to assist the player's reasoning at any time.

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Markdown version of https://cerebralvalley.ai/e/gemini-3-tokyo-hackathon/hackathon/gallery/36. Site index for agents: https://cerebralvalley.ai/llms.txt · full text: https://cerebralvalley.ai/llms-full.txt