Describe a game. Play it a minute later.
Sandbox is an agentic three.js game builder. Write a sentence and an agent plans the scene, writes the code, and hands back a world you can play in the browser — no engine, no install, no boilerplate.
> a low-poly island racer with drift physics and a sunset skybox
Describe it
Plain English. A racer, a shooter, a puzzle, a world to wander. The more you say, the closer it lands.
Watch it get written
The agent works in a live sandbox — reading, editing and re-reading its own three.js source while you watch.
Play it immediately
Every build serves a playable page. Keep talking to change it: new mechanics, new levels, a different feel.
Pricing
You are billed for what the model actually costs to build your game, drawn from a credit balance. Nothing runs when you are not building.
Free
$0.25
Credits to try it with, granted to every new workspace. Enough for a first game.
Builder
$20/mo
$10 in game-building credits added every month, and everything you build stays yours.