Prompt Heist: a game where you talk your way past Gemma-powered guards (and learn how to defend AI apps)
What we built Prompt Heist is a browser game about prompt injection. You are the Cipher Phantom, and you talk your way past AI guards to learn their secret code. There are 5 kingdoms with 6 gates each, 30 levels in all. Every guard is a real language model, **Gemma 4 , running locally through Ollama. After each level the game explains what trick worked, why the guard was vulnerable, and how a…
Prompt Heist is a browser game that teaches players how to defend against AI guards through prompt injection. Players take on the role of Cipher Phantom, using Gemma 4 language models running locally on Ollama to talk their way past the guards and learn their secret code. The game consists of five kingdoms, each with six gates, making for a total of 30 levels.
Each guard is a real language model, and the game explains the tricks used, why the guard was vulnerable, and how real applications would defend against it. The game was built by Team StromBreaker during Hacktoberfest Hack Day in Coimbatore, 2026, for the Best Open-Source AI Project challenge. It can be found at https://github.com/shreesanth-78/hacktoberfest-hack-day-coimbatore-x-init-club-and-idea-club.
The game teaches that failing without consequences is a good way to learn, and it uses three lives per level with a strike after a wrong message. The backend decides when a level is won, ensuring fairness even when the model is unpredictable. The game also covers five different domains, including water-grid maintenance, clinical-trial matching, customs classification, insurance, and e-waste recovery.
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