Oxygen Not Included is a space-colony simulation game. Deep inside an alien space rock your industrious crew will need to master science, overcome strange new lifeforms, and harness incredible space tech to survive, and possibly, thrive.
Recent Reviews:
Mostly Positive (510) - 76% of the 510 user reviews in the last 30 days are positive.
All Reviews:
Very Positive (3,282) - 88% of the 3,282 user reviews for this game are positive.
Release Date:
May 18, 2017

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“Since 2012, Klei has used Early Access as a tool to gather feedback and build our games in collaboration with our community, producing games like Don’t Starve, Don’t Starve Together and Invisible Inc.. We’ve found this process works for us, and we hope you find it works for you, too.

Our current project, Oxygen Not Included, has already majorly benefited from the feedback provided by players during its Alpha period. By releasing this game in Early Access, we hope to continue to grow our community and get more people involved in its development.”

Approximately how long will this game be in Early Access?

“We still have a lot more in store for Oxygen Not Included, and plan to continue growing and updating the game well into 2018.”

How is the full version planned to differ from the Early Access version?

“The plan for the full version of Oxygen Not Included is to create even more content to allow players to manipulate, automate, and harness the world their Duplicants live in. Duplicants will also become more robust as their needs and abilities evolve over time. To complement this, there will be new biomes to discover, new creatures to interact with, world events to deal with, and more.

We will also be exploring the lore of the game, slowly uncovering the history of the world and why the duplicants are trapped on a giant rock hurtling through space.

Mod support is also very important to us, so we expect to have full workshop support by launch or shortly thereafter.”

What is the current state of the Early Access version?

“Oxygen Not Included currently contains all the core systems that will be evolved and iterated upon during Early Access such as thermodynamics, density, plumbing, stress and hunger. The game has already been played by over 150,000 players in its current state, many of whom report hundreds of hours played. We’re amazed by the breadth and depth of creations that players have made and we’re looking forward to building upon that.”

Will the game be priced differently during and after Early Access?

“The base price may be increased upon release from Early Access.”

How are you planning on involving the Community in your development process?

“We're continually talking to our community about our design process and keeping them informed of our decisions and improvements with regular updates. Please join the discussion on our forums at http://forums.kleientertainment.com/forum/118-oxygen-not-included/”
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Recent updates View all (23)

September 13

[Game Update] HOTFIX - 231825 & 232512 (9/14/2017)

HOTFIX - 231825 (9/13/2017)
  • Germ icons should now properly disappear in the germ overlay if a duplicant no longer has any germs
  • Plants should no longer sometimes unmark themselves for harvesting
    fixed a performance/memory leak
  • Dupes should no longer get stuck at the wash basin/orescrubber/hand sanitizer
  • Fixed a bug where your starting base would sometimes be fully entombed
HOTFIX - 232512 (9/14/2017)
  • fixed slime lung sometimes not showing up in new worlds
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August 31

Oxygen Not Included Roadmap

Originally posted by Bigfoot on the official forums.

Hello everyone!

With the release of our latest major update and moving on to the next one coming on October 5, I thought it would be a good time to talk about the roadmap for the game.

The Outbreak Upgrade was a bit rough. Given the feedback, it was clear that we misbalanced the early game difficulty of disease, and we worked hard to identify that and improve things as soon as possible. Additionally, while we agree that a new system was not the most requested feature in the game, we felt strongly that we needed to bite the bullet and work on building out the base systems before digging deeper into those systems.

At its core, Oxygen Not Included is about building a thriving colony on an unforgiving asteroid. The game is a huge simulation, with tons of layers that are constantly being simulated at all times. The interaction of these systems is both what creates challenges for the players and the opportunities to exploit it.

In order for us to build such a system, it requires that we build a solid foundation to work on. With the latest update, we believe the core systems are now in place, and are now building deeper into the tech tree. 

The following is a broad view of what you can expect as we fill out the rest of the game:

More variety in the world
We will continually be expanding what the world holds for the players. This means more biomes, more elements to manipulate, more creatures, and so on.

The exploration of the world is a key part of the discovery process.

Deeper Tech Tree
If the variety in the world creates the ingredients, then the tech tree is the way players can manipulate it. We will continue to advance the tech tree to allow greater use of the materials and systems in the world. This includes advanced refinement techniques, building protective suits for Duplicants, better resource extraction, improved logistics to increase efficiency, and so on.

One of the core principles of the game is that everything you do creates externalities. Want to breathe some oxygen? It produces CO2. Want to electrolyze the water to create O2? It also creates Hydrogen. Want to go to the toilet? Better have a place to put the waste product. 

The tech tree will continue to push players to manipulate the systems to handle these externalities, and even use them to your advantage. 

More Duplicant interactions
Currently, Duplicants mostly interact in solitary ways. Over time, we will be adding more ways that the Duplicants will notice the presence of each other. Loud sleepers or duplicants helping to heal each other are examples of such interactions, but many more are possible.

We have many ideas for this, and will expand on it as we get closer to implementing them.

Lore Discovery
The reason why Duplicants are stuck on this Asteroid and the background of the world will slowly be revealed.


In the final phases of the game, we expect the tech tree to be much deeper than it is now, extending to what we would call “space tech”. During that phase, the Duplicants will discover why they are trapped on an asteroid, and what they can do about it.

During Early Access the game will evolve. As the team builds upon the game sometimes it may be too easy, sometimes it may be too difficult, and sometimes it could just be wrong. The process of Early Access helps us land exactly where we want the game to be, and we’re thankful for your feedback as a community helping us to achieve that. We truly think the game is better because of your involvement.

This is our 6th Early Access title, but the process is never simple. What you can be sure of is that we always put our full effort to complete our games -- since we launched on Steam the team has grown, and we will continue to build and support it fully to the end.

Thanks so much for your support of our game, we hope you enjoy your journey with us as we continue to develop it!

And that’s it! With all that said, here is a sneak peak image from the upcoming update.


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About This Game

In the space-colony simulation game Oxygen Not Included you’ll find that scarcities of oxygen, warmth and sustenance are constant threats to your colony's survival. Guide colonists through the perils of subterranean asteroid living and watch as their population grows until they're not simply surviving, but thriving...

Just make sure you don't forget to breathe.

Build Extensive Bases and Discover What it Takes to Survive:

Everything in your space colony is under your control, from excavation and resource allocation right down to plumbing and power systems. Resources will begin depleting with your first breath, however, so be sure to dig fast if you want to live.

It’s Mind Over Matter with Stress Simulations:

Keep the psychological impact of survival at bay with fun leisure activities, great accommodations and even better food for your colony. Duplicants each have different and potentially destructive ways of reacting to stress, so be sure to always keep them happy. Whatever the cost.

Avoid Boiling with Thermodynamics:

Temperature control is a constant concern in space; too cold and you'll freeze, too hot and you'll fry. Keep tabs on ambient environmental temperatures and your colony's heat production to maintain a nice, cozy atmosphere for your colonists.

Enhance Efficiency through Complex Gas and Liquid Simulations:

Create interlocking pipe systems to swiftly deliver fuel and liquid to critical areas of your base. Plan well and be rewarded as your colony transforms into an imperishable, well-oiled machine.

Take Charge with Power Grid Simulations

Choose from a multitude of power sources including coal, hydrogen, natural gas or just plain old elbow grease. Manage power runoff, circuit overloads and meltdowns to keep your colony running smoothly.

Always Keep Yourself Breathing:

Enter the Oxygen Overlay and watch air moving through your base in real time. Monitor carbon dioxide accumulation and oversee oxygen generation processes to mold your colony into a veritable deep-space oasis.

Waste Nothing through Extreme Recycling

Make use of every last resource for a base that truly exemplifies efficiency. Recycle waste into precious fuel, process unbreathable gas into air or harness the natural bodily processes of wild creatures for food. If you’re clever, you might even be able to run a base off colonist farts.

Explore Diverse, Procedurally Generated New Worlds:

Summon new worlds with a push of a button. Experience tons of untamed space rocks, then suffocate to death in them!

System Requirements

Mac OS X
    • OS: Windows 7 (64 bit)
    • Processor: Dual Core 2 GHz
    • Memory: 4 GB RAM
    • Graphics: Intel HD 4600 (AMD or NVIDIA equivalent)
    • DirectX: Version 11
    • Storage: 2 GB available space
    • OS: OSX 10.9
    • Processor: Dual Core 2 GHz
    • Memory: 4 GB RAM
    • Graphics: Intel HD 4600 (AMD or NVIDIA equivalent)
    • Storage: 2 GB available space

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