What is Universe Sandbox ² ?

Universe Sandbox ² is a physics-based space simulator.


It merges gravity, climate, collision, and material interactions to reveal the beauty of our universe and the fragility of our planet.


Create, destroy, and interact on a scale you've never before imagined.



OS Logos

For Windows, Mac, and Linux.

Full system requirements



STEAM Early Access

Windows, Mac, Linux

Buy above or directly from...


Steam Humble Store





What can you do with Universe Sandbox ² ?

Simulate Gravity

N-body simulation at almost any speed using Newtonian mechanics. Real science, real physics, no supercomputer required.

Earth & Moon Collision

Collide Planets & Stars

Epic, mind blowing collisions of massive planetary bodies.



Model Earth's Climate

Watch sea ice grow and recede with the seasons because of the tilt of the Earth: change the tilt and change the seasons. Or move the Earth farther from the Sun and freeze the entire planet.

Learn more...


Terraform Planets

Add carbon dioxide to a planet's atmosphere to heat it up. Then add water...


Deform Surfaces

Impact planets with asteroids and comets and leave behind massive, molten craters.


Supernova a Star

Make a star evolve by cranking up its age or mass, then watch a supernova unfold.


And more...

  • Material System - build planets out of Hydrogen, Iron, Rock, & Water
  • Solar flares & volatile trails
  • Procedurally generated
    stars and planets
  • Pulsars
  • Light-warping black holes
  • Dark matter





Universe Sandbox ² Gameplay Video

Demonstration of Universe Sandbox ² Alpha 7

More videos from Chad, technical artist & developer for Universe Sandbox ²

Collision Tests in Universe Sandbox ² Alpha 7

More videos from Thomas, numerical physicist & developer for Universe Sandbox ²




What Are People Saying About It?

It's easy to use, beautifully tutorialised, and hugely fascinating.

Rock Paper Shotgun

I just finished playing and my mind is blown. I spent most of my time staring at the screen, smiling like an idiot.

Dan & Matt

Who hasn't wanted to crash the Earth into the sun or bombard the moon until it's nothing but a pile of rubble?

EpicBeard Gaming

Most epic moment - increased the mass of the sun when it suddenly flashed insanely in a giant supernova. Epic touch.

Take on Mars developer

...a vast improvement over the original. ... an incredibly enjoyable simulator.


It's like my great grandfather always used to say, 'Nothing like destroying 45 simultaneous instances of the Milky Way to brighten up a bad day.'


Everyone should be playing Universe Sandbox ².

Neill Blomkamp, writer & director of the films District 9 & Elyisum

To describe the simulated destruction of Earth as satisfying is to undersell the delight of a child with a magnifying glass and some plastic soldiers.


I just love this stuff. I could explore this game all day.


Love this program. So pretty. You guys really outdid yourselves!!

The Professor, Know Idea 4zzzfm

If the water starts to evaporate, this might be one of the best games ever made... [water evaporates]


This game is so ******* cool.

PewDiePie, the most subscribed user on YouTube

A space simulator like no other: The Sims meets Elite meets Stephen Hawking's archives.

Red Bulletin

This simulator really puts you in the driver's seat to the universe we live in.


...the greatest science games of all time. You guys are doing incredible work and creating things I've never seen done before... You're all making something special.

Eric Warncke





Sign Up for Updates

We will email you about once per month; easily unsubsubscribe anytime. We will never sell your email.




Who's Making It?

Dan Dixon

Project Lead & Creator

Christian Herold

Developer & Code Architect

Georg Steinröhder

Developer & Shader Wizard

Thomas Grønneløv

Numerical Physics Developer

Naomi Goldenson

Climate Scientist & Developer

Chad Jenkins

Developer & Technical Artist

Jenn Seiler

Astrophysicist & Developer

Ryan Macoubrie

Composer & Sound Designer

Jared Meier

Operations & Support

Collectively we are Giant Army.

Standing on the shoulders of giants...