Prompt Override is a hacking-themed serious game where the player is a novice hacker collaborating with a rogue Large Language Model (LLM) to infiltrate and eventually dismantle a criminal corporation. The game showcases (through a real LLM-based simulation) real-world risks of prompt injection, as the player's carefully crafted inputs trick the antagonist LLM to ignore its system prompt leading to leaked data or misinformation, and model misuse.