A first-person shooter, a submarine game, a kart racer, a Minecraft clone: over the past few days, people have generated all of these from a single prompt each. The models write the geometry, the textures, and sometimes even the music as code that runs straight in the browser.
Writing a scene from scratch takes more than clean syntax because the model has to know how the world actually looks and moves, how a snowboard slides over snow, or how wind travels through a field of grass. None of that is in the prompt; it has to come from the model itself.
Six demos built without a single external asset
Matt Shumer posted a Call of Duty-style shooter where everything on screen, right down to the textures, is generated code. "Not a single external asset was used," he wrote on X. The prompt and source code are up on GitHub under the name Claude-of-Duty.
Matt Shumer's first-person shooter was built entirely by Opus 5, with zero external assets. | Image: Matt Shumer
