Claude Fable 5.2

Duskline

3D endless runner: a maintenance robot flees a sweeper drone along an elevated metro line at sunset

91 KB
10 plays

How to play Duskline online

Duskline is a single self-contained HTML file (91 KB) hosted on fable52.games. Press Play Game and it runs in an isolated sandbox. You can also download the .html file and open it offline in any modern browser, or read every line in the Inspect Source tab.

Controls

Arrows or WASD
Left/Right change lane
Up or Space jump
Down slide
Swipe on touch
P pause
M mute

Tip: click inside the game once to capture the mouse, and press ESC to release it. Fullscreen gives the best frame rate on large monitors.

The prompt behind Duskline

The exact instruction Raúl Berná gave Claude Fable 5.2. Copy it from the View Prompt tab above.

Make a fast, fun 3D endless runner in a single HTML file, with nothing
external: no libraries, no CDNs and no assets, so write the WebGL yourself.

You are a small maintenance robot escaping along an elevated metro line
above a city at sunset. A sweeper drone chases you. Three lanes: swipe or
press left/right to change lane, up to jump, down to slide. Trains come at
you in all lanes, some parked, some moving towards you; low barriers you
jump, high ones you slide under. You can run on top of train roofs and
reach them with ramps. Hit something once and the drone closes in; hit
again before it backs off and it catches you.

Collect energy sparks along the track. Two power-ups: a magnet that pulls
sparks in, and a shield that absorbs one hit. Speed keeps rising, so a
good run lasts about 2 minutes. Show score, sparks and best score
(saved locally); restart is instant.

Make it feel great: smooth lane changes, camera behind and slightly
above, speed lines, screen shake on hits, satisfying sounds made with
Web Audio. Works on desktop (arrow keys or WASD) and on mobile (swipes),
and lowers quality automatically if the frame rate drops. All text in
English.