You drop into Saltline Terminal, a wet container port at dusk, with a rifle and three relays to cut while the port's security net fights back, and then you have to reach the boat. The lighting, rain and gun model are the draw, and the launch post drew debate over how close it gets to a commercial shooter. A run is short.
How the creator made it
The creator gave Claude Fable 5.2 a short prompt and no feedback, to test what the model could do on its own. Every model, texture and sound in the game is made in code. The first version took 8 hours, they say, and they then spent two more hours on the weapon models, sounds and some gameplay for the current version.
- Time
- In the creator’s words, the first version “Took 8 hours!”, with no feedback from them along the way. For the current version they say they spent “an additional two hours” improving it. ↗ ↗
- Code
- They tested Claude Fable 5.2 with “one-shot prompts without human feedback”, in their words; the prompt they shared is shown below. Asked how they guide Claude, they answered “my claude.md is empty”. ↗ ↗ ↗
- Art
- There are no image or 3D model files: in the creator’s words, “All textures and models are functions” and “Claude didn't draw, it wrote shaders.” The game’s start screen says “Every surface, machine and sound is generated in your browser.” ↗ ↗
- Levels
- They asked for a small game with a lot of detail: “Insanely detailed quality”, but “small in scope (like a tiny level)”. ↗
- Sound and music
- The sounds were made from scratch in the same run, like the models and textures. They were also among what the creator worked on afterwards, along with the weapon models and “some gameplay work”. ↗ ↗
- Cost
- In the creator’s words: “~$550 at API pricing, ~2.7M output and 445M input tokens, heavily cached.” ↗
If you want to try something like it
- Ask plainly, as they did. Their prompt, shown below, is a few casual sentences asking for top quality in “a tiny level”, and they say “the age of prompt engineering is basically over”.
- Compare the two versions: the note from Felix on the game’s start screen links to the one-shotted version, so you can see what their extra work changed.
- Read how it was done: the creator says the source is in the game’s HTML, so you can inspect it yourself.
From their post on X ↗, 3 other posts on X (1 ↗ 2 ↗ 3 ↗) and a page on claude.ai ↗.
The prompt
You know, you should also build me a FPS. Insanely detailed quality pls, something that looks visually like it can keep up with AAA. Make it small in scope (like a tiny level) but otherwise impressive photorealistic graphicsThis is part of the prompt; the creator didn't share all of it.
More like this
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- CORDON 9Hold a rain-soaked city checkpoint against endless waves of the dead in a first-person shooter whose every model, texture and sound is made in code.
The game and its prompt belong to @felixrieseberg. Preview recorded by us. Made this game? Here's how we list it.