Underground Exploration Sandbox Game

A roughly 20-second screen recording of a top-down underground exploration sandbox game. The author first speaks the concept to Opus 5.5, which turns it into a structured prompt, then hands that prompt unchanged to GPT-6 Sol, which builds the entire game in about an hour. Darkness and differently colored lights are the stars of the frame, across five zones including the shallow layer, crystal caves, and lava fissures. Good for game-dev demos and AI-builds-a-game social clips.