About the challenge

Case Closed is an asynchronous agentic hackathon.

Your mission: build an autonomous detective agent capable of solving procedurally generated murder mysteries.

Your agent will interact with a custom investigation environment through a simple HTTP API. It must gather evidence, interview witnesses, reason about timelines, and ultimately identify:

• The culprit
• The means
• The evidence-backed timeline

Actions costs budget. Seeds presents new mysteries. The best agents will balance reasoning, exploration, and efficiency.

We strongly encourage participants to build using Railtracks, though teams are free to incorporate additional tools, models, and frameworks as desired.

Unlike traditional LLM benchmarks, scoring is fully deterministic. Submissions are evaluated against hidden ground-truth solutions using evidence attribution and mechanical scoring.

Get Started

1. Register your team
2. Read the API documentation
3. Open a mystery seed
4. Build your detective agent
5. Submit your repository
6. Compete on the live leaderboard

The environment can be accessed entirely through HTTP requests—no SDK required.

• Correct Culprit
  
• Credited Timeline Steps
  
• Correct Means
  
• Efficiency Bonus