MOTHLIGHT // Vesper-9

Race through a rain-soaked neon city, taking 12 light gates in order across five districts to carry the scattered city consciousness, LUMEN, back to the central Spire.

From walking game to night run

MOTHLIGHT began as a first-person exploration game. You walked five districts, rode grav-lifts and read lore terminals. The third prompt turned it into a driving game, the "Night Run". The city, facades, rain, signs, monorail and holographic moths all stayed, while the walking controller was replaced with arcade car physics, handbrake drifts and boost.

How it works

• City: a seeded 9×9-block city of 694 buildings drawn in a single instanced call
• Windows: interior mapping draws rooms and shops with real depth behind flat facades
• Streets: mirror-wet asphalt, rain, neon signage, a monorail, pedestrians and holographic moths
• Car: the body reflects a live environment map of the city, and the headlights light the street surface
• Stack: about 2,100 lines of JavaScript and GLSL across nine modules, unit-tested city generator and collision, bundled by esbuild into one offline HTML file

Controls & tips

• W / S throttle and brake, A / D steer, Space handbrake, Shift boost (sliding refills it)
• Q pulse the grid, R back to the last gate, C camera, M mute
• Drift through wide corners to refill boost, then spend it on the long avenues between districts

The prompt

Made from the third sentence: "Polish the cyberpunk one too; I want to turn it into a driving game in a cyber city."

Credits

By hahaliu1029, released under the Apache License 2.0.

The story

Vesper-9 is a rain-soaked city ("rain index 0.93") whose street lamps were once run by a mind called LUMEN. The Halcyon corporation switched it off and "sold the dark back to us", and LUMEN was scattered into twelve echoes strung across the streets. Your Night Run carries them home to the Spire.

Objective

1. Drive through the 12 light gates in order. Only the next gate is lit, and the minimap marks it (N ↑, ● next gate).
2. Each gate gives you back one echo, a line of LUMEN's memory, and the HUD counts ECHOES x/12 and DISTRICTS x/5.
3. After the twelfth gate: "ALL ECHOES CARRIED. Bring them home. The ring in front of the Spire is lit." Drive through that ring to finish.

The clock starts the moment you move. At the end you get "SIGNAL RELEASED" with your time, and NEW BEST if you beat your record. After the finale the city stays open to cruise.

The five districts

District	Character
Halcyon Core	Corporate spires
Kessel Market	Night stalls and steam
Lantern Row	Stacked tenements
Glasswater	Towers over the tide
The Sump	Pumps, pipes, old grid

Driving tips

• Handbrake drifts refill the boost. Slide the tail through corners with Space, then spend the boost (Shift) on the long, straight avenues. The HUD shows BOOST READY when it's charged.
• Missed a turn or wedged against a wall? Press R to jump back to the last gate, already pointed at the next one. It's faster than reversing out.
• Q sends a pulse ring through the grid around your car. It needs about 4 seconds to recharge between pulses.
• C switches between the two camera views; M mutes.
• Your progress (gates taken, districts, best time) is saved in the browser. IGNITION continues where you left off; NEW RUN starts the clock from zero.

Controls

Key	Action
W / S	Throttle · brake and reverse
A / D or arrow keys	Steer
Space	Handbrake (sliding refills boost)
Shift	Boost
Q	Pulse the grid
R	Back to the last gate
C	Camera
M	Mute