As part of an internal AI/LLM security training day, I built a prototype of this game. Seeing the positive response (and getting self nerd-sniped), I had a model improve the scalability and get it running on Cloudflare Workers instead of Python Flask.

Basically you create two(+) prompts, a defensive system prompt that aims to protect a secret flag value, and attack prompts that try to get other "warriors" to reveal their flags.