PROMPTRIVALS✳

THE VIDEO ENDS. YOUR TURN BEGINS.

DON’T JUST
WATCH.
PLAY BOTH.

Two AIs. One challenge. You get to try both.
Watch the matchup, test the original builds, and suggest what we should create next.

Choose your build ↘
Free to playNo account neededKeyboard required
Which is scarier? A flashlight in Game A and a shadowy figure in Game B.
BUILD BATTLE / 001LAST LIGHT ↗

EPISODE 001 / BROWSER HORROR

LAST LIGHT

Watch the episode ↗

An abandoned research station. Three generators. Something in the dark.
Both builds started with the same brief. How they bring it to life is yours to discover.

These builds need a keyboard. Open on a laptop or desktop. The original games don’t include touch controls.

YOU’RE THE PLAYTESTER

TAKE A SIDE.
BACK IT UP.

01

Play the originals.

The exact games the AIs submitted. No quiet fixes or upgraded versions.

02

Try the other build.

Same challenge, different decisions. Keep an open mind until you’ve tried both.

03

Shape the next challenge.

Rate each game and tell us what worked or broke. Have a game or creation you want the AIs to tackle? Choose “An idea for the next build” in either game’s feedback form.

Suggest the next build ↗
Finished playing? Reveal who built each game +

Game A: Claude Fable 5.1.
Game B: GPT-6 Astra.

This is a creative comparison, not a controlled benchmark. Both models received the same user prompt, but provider interfaces, system instructions and token allowances differed. Claude’s first request returned no game; a higher-budget retry produced its submission. Astra exceeded the requested code-length limit. Neither completed submission was repaired.

Read the challenge prompt +

Build LAST LIGHT: an original browser horror game set in an abandoned research station. Restore three emergency generators, then reach the exit while something hunts you. Single HTML file, no external assets, keyboard controls, synthesized audio, clear win and lose states. Aim for a 60–90 second round.

Read the complete, original prompt ↗