Build a world, one prompt at a time

Walk around right in your browser, then say what should happen, like "add a dragon" or "make it snow", and it gets built into the world you're standing in.

Walk around Alien World

What people say

I started with a flock of boids, made them fight for energy, then turned the floor into the Game of Life. Having way too much fun with this. It's a canvas for curiosity!

Fraser Price

Mind successfully blown. It runs great on my machine, the responses come back fast, and the worlds it builds are incredible. So, so fun.

Noah C

This brought up something in me that I haven’t felt since I was a little kid. It’s like the huge heap of sand in the backyard, or a plastic bag of incongruous Lego pieces. You can build anything!

Stas Bichenko

Walk into any of these

Then press Edit World to make it your own.

One prompt Dinosaur Valley

A steamy prehistoric valley with giant ferns and palm trees, a smoking volcano in the distance and a lake where long-necked dinosaurs graze. Pterodactyls circle overhead and a T. rex stomps along the far shore.

One prompt Candy Kingdom

A candy kingdom with gumdrop hills, lollipop trees and a chocolate river winding past a gingerbread village. A castle made of frosted cake stands on the tallest hill, and cotton candy clouds float in a pink sky.

One prompt Toy Room

I'm tiny on the floor of a kid's bedroom. Giant wooden blocks stacked into towers, a toy train looping around its track, crayons as big as logs, a huge teddy bear slumped by the bed and sunlight streaming through the window.

More Examples

What you can do

The Starship's promenade, where a robot butler that was just added walks toward you carrying a tray of drinks

Say what should happen, and it gets built

Type a change like "add a robot butler serving drinks on the promenade," and it appears in the world you're standing in: new things, new rules, and characters that move and talk.

Walking down the path of Fun Park, toward a Ferris wheel, a roller coaster and a carousel, with the keys on screen

Walk around inside it

Every world opens right in your browser, with nothing to install. Walk with W A S D, look around with the arrow keys or the mouse, run and jump. On a phone, it's a thumb stick and a drag.

Alien World's red mesas, with a UFO just added from the gallery, which is still open and searched for UFO

Drop in something ready-made

Search for a UFO, a dragon or a puppy and it lands right in front of you, instantly and for free.

A tornado on a Big City street beside a fire truck spraying water, and History beside it listing each change with Undo and Go back

Undo anything, or go back in time

Every change is saved as a version. Undo just the tornado, or take the whole world back to any point, and come forward again whenever you like.

The Share dialog over Fun Park's carousel, with switches for who can visit and copy the world, and its link

Share it, or let people remix it

Keep a world to yourself, share it with a link, or make it public, and let visitors start their own copy to build on.

Start for free

Every change you ask for uses a few credits. Start with 200 free, or get more every month.

Free

$0

200 credits to start ~33 world changes

Pro

$12/month

1,200 credits every month ~200 world changes

Max

$30/month

4,000 credits every month ~660 world changes

See plans

Common questions

Do I need to install anything?

No. Worlds run in your browser, on a computer or a phone.

What's a credit?

Each change you ask for uses a few credits, more for bigger changes: about 6 for a typical change. Adding things from the gallery is free.

Does it work on my phone?

Yes. You walk with a thumb stick, look around with a drag, and tap Change to describe what should happen next.

Can I start from scratch?

Yes. Start from an empty meadow or a blank canvas, or copy any ready-made world and change it however you like.

Who can see my world?

Only you, until you share it. You can share it with a link, let visitors make a copy of their own, or make it public so anyone can find it.

What happens when I run out of credits?

Your worlds stay just as they are, and you can still walk around them. Pro and Max get more credits every month, and can buy extra packs too.

Build your first world

Start from an empty meadow, or walk into a ready-made world and make it your own.

Walk around Alien World