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



Windows, Mac, Linux

Universe Sandbox ² is a Steam Early Access game still in active development. It is not yet finished. Access to the alpha is provided via Steam code. For code redemption, a free Steam account is required.






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?

Thank you guys so much for creating this. Astrophysics is a passion of mine, and it makes me so happy to see that others have taken that love and created such a beautiful piece of work.


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

I can honestly say that this is the coolest bit of software I've ever seen. The surface effects on the planets are amazing. The sun!

Uber driver

There is not a single title like this in terms of accuracy and quality.


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


...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

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

Take on Mars developer

This new release is simply amazing... Love the added features... Love it, Great Job!

B. Beard

I can sit at home and just play it for hours.


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

The Professor, Know Idea 4zzzfm

This is [a] fantastic tool in understanding the mechanics of the universe.


Absolutely perfect. A few performance tweaks and I'd be spending thousands to get it!

camelia_sas This game... sim... thing is ******* awesome.


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

Red Bulletin

Having the moon impact the earth and seeing the polar caps melt due to the heat of the impact is absolutely awesome! I then grabbed just the earth, boiled the seas, froze it over, and then put it back to 12 degrees to see what would happen. It is fantastic to explore with!

GDC attendant

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





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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

Jared Meier

Operations & Support

Collectively we are Giant Army.

Standing on the shoulders of giants...