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FreeIn developmentPlays in your browserOne prompt · No hand edits2D · action platformer

Lanternfall

Keep the last light burning through a drowned city.

Made with Codex (GPT-6.1 Sol) · Claude Sonnet 5.5

Latest build · updated Oct 18

Built by Codex from one detailed prompt, with no human edits. One follow-up asked for a visual polish pass.

Play

Runs in a recent desktop or phone browser (tested in Chrome). On a phone, turn it sideways; touch controls appear on their own.

Lamplighters' Row
Lamplighters' Row
The Undertow
The Undertow
The Dimmer
The Dimmer

About the game

Carry your lantern through the Drowned Steps, Lamplighters' Row and the Undertow. Light reveals the path, burns back the shadows and costs oil. At the bottom waits the Dimmer.

  • Four levels: the Drowned Steps, Lamplighters' Row, the Undertow and the Dimmer
  • A three-phase boss fight
  • Save shrines and wick choices
  • Keyboard, controller and touch

Who built what

  • Codex (GPT-6.1 Sol): the game: levels, scripting, the boss and the polish
  • Claude Sonnet 5.5: the sprite pack, from Nano Banana Pro reference art

Controls

Move
A D or arrows
Jump
Space
Lantern beam
J
Flare burst
K
Bind wick
E
The promptLanternfall
  1. You're a tiny lantern-bearer descending into a drowned, lightless city.
  2. Your lantern is everything: it lights the way, burns the shadows and runs on oil.
  3. Four parts: the Drowned Steps, Lamplighters' Row, the Undertow and the Dimmer.
  4. Follow-up: give it a visual polish pass.
The opening of the prompt and its one follow-up. No hand edits. Made with Codex (GPT-6.1 Sol) · Claude Sonnet 5.5.

Building in the open

Lanternfall is being built in public.

Every build here is the latest one. Drag a picture to see how it changed.

The Dimmer, before
The Dimmer, polished
BeforePolished
The Dimmer The boss arena, lit for the final fight.

Latest update ·

Finished, and in the browser

All four levels, two save shrines and the three-phase Dimmer. It ships as a signed Mac app and now runs in the browser.

Coming next

  • Touch controls tuned for phones
  • Faster loading in the browser

Updates

Lanternfall · Arcwright team ·

Lanternfall is finished

All four levels, two save shrines and the three-phase fight with the Dimmer. It ships as its own signed Mac app, and now runs in the browser too.

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