SUBLEVEL 07

SUBLEVEL 07 is experiment 04 from fable52-fps-repro, a set of independent, reproducible single-prompt experiments inspired by Saltline. It is not Saltline; it is what Fable 5.2 produced when given a one-line FPS request from scratch.

How it was built

The prompt is a single sentence asking for an "insanely detailed", AAA-looking but tiny FPS level, plus an environment note: one HTML file, libraries only from a CDN, and no external models, images or audio. Running in Claude Code, the model worked for 40.8 minutes over 73 turns with no human input. The author measured the cost at $15.96 at official API prices, with a 90.9% cache hit rate, and re-checked the figure line by line.

How it works

• One 128 KB file: Three.js r170 is loaded from jsDelivr; everything else (level geometry, materials, enemies, UI) is generated in the file
• Wet-floor reflections: a flooded underground substation whose floor reflects the corridor in real time
• Combat: a red-dot carbine with reload mechanics against three waves of hovering drones
• Audio: 18 sound effects, all synthesized with the Web Audio API
• Self-testing: the model also wrote an automated script that beats all three waves with zero console errors

Controls & tips

• WASD move, mouse aim, click fire, ESC releases the mouse
• Reload between waves rather than mid-fight; drones arrive in groups
• Compare it with Saltline: about a tenth of the size and a fraction of the build time, yet still a complete loop

Credits

By wquguru, released under the MIT License. The repository also contains the runner scripts, the system prompt and three smaller experiments (audio, materials and models).