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About the Game
Oxygen Not Included is a space-colony simulation where you keep a colony of Duplicants alive inside an alien asteroid.
Oxygen Not Included is an independent simulation game from Klei Entertainment, and it puts you in charge of a colony living beneath the surface of an alien space rock. Oxygen, warmth and food are constantly scarce, and resources start running down almost as soon as you begin. Everything in the colony is under your control, from excavation and resource allocation to plumbing and power systems, so every early decision matters.
The core loop is build, monitor and adjust. You dig out new space, route gas and liquid through interlocking pipes, and pick from power sources such as coal, hydrogen, natural gas or plain old manual labor. Then you watch for power runoff, circuit overloads and meltdowns. The Oxygen Overlay shows air moving through your base in real time, which makes carbon dioxide buildup and oxygen generation easy to track and turns breathing into a planning puzzle.
Your colonists have their own psychological needs. The store description stresses that Duplicants react to stress in different and sometimes destructive ways, so leisure activities, good accommodations and better food become essential. Temperature is another constant concern, because the base can freeze or fry if you lose track of ambient temperatures and heat production. Recycling is a big part of the appeal too: waste can be turned into fuel or processed back into breathable air.
What stands out most is the variety of the worlds. Each new asteroid is procedurally generated, and you can summon a fresh one with the push of a button. The store page also jokes that a clever player might run a base on colonist farts, which captures the game's quirky tone and its focus on squeezing every last resource out of a base.
Feature Highlights
- Gas and liquid simulation lets you build interlocking pipe systems that deliver fuel and liquid to the critical areas of your base.
- A power grid simulation offers several sources, including coal, hydrogen, natural gas and manual power, along with overloads and meltdowns to manage.
- The Oxygen Overlay displays air moving through your base in real time, so you can monitor carbon dioxide and oxygen generation as you go.
- Stress simulation tracks how each Duplicant reacts to pressure, and leisure activities, accommodations and food help keep them happy.
- Thermodynamics mechanics make temperature control a constant concern, since you must balance ambient temperatures against your colony's heat production.
- Procedurally generated worlds can be summoned at the push of a button, so each new asteroid offers a different starting challenge.
Who It Is (and Is Not) For
Recommended For
This game suits players who enjoy systems-driven simulations and get satisfaction from watching interconnected parts work together. If you like planning ahead, fixing cascading problems and turning scarce resources into a stable base, the constant tinkering will feel rewarding. It is a single-player game, and the store listing also notes Family Sharing, so it can be shared with people in your household.
Not Recommended For
Players who want a quick, relaxed experience with few moving parts may find the constant management overwhelming. Anyone looking for a multiplayer game should look elsewhere, since the listing shows single-player only. Readers who need a Traditional Chinese interface should also be aware that the game does not list Traditional Chinese among its supported languages.
What the Steam Reviews Say
Oxygen Not Included carries the Steam label Overwhelmingly Positive, which appears as 壓倒性好評 in Steam Taiwan wording. It sits at a 97% positive rating across hundreds of thousands of reviews. That combination is strong: a rating this high, backed by a volume this large, shows that the overwhelming majority of players who finished reviewing the game were satisfied with it.
On Steam, the label is calculated from the percentage of positive reviews and the total number of reviews, so a very high percentage on a large sample is a meaningful signal. Smaller review counts can swing sharply and are less reliable, but a title with hundreds of thousands of reviews gives a far more stable picture. Keep in mind that a high score reflects general satisfaction, not whether the complex management style suits your personal taste, so reading recent reviews on the Steam page can help you decide.
Price History & Historical Low
Show price changes as a table
| Date | Price | Discount |
|---|---|---|
| 2026-10-30 | NT$378 | — |
| 2026-10-16 | NT$378 | — |
| 2026-06-18 | NT$113 | -70% |
All prices below are Taiwan Steam store prices in NT$. The current price is NT$ 378, which matches the regular price, so the game is not on a tracked discount at the moment. Our records show a lowest paid price of NT$ 113, recorded on 2026-06-18, and a deepest discount of 70 percent. The game has been discounted often in that period, and we have not recorded a free-to-keep promotion for it.
Our price record is still short, so any verdict on timing is tentative. The fact that the game goes on sale often suggests that waiting for a markdown could pay off, while the current full price is the highest we have recorded. If you are not in a hurry, adding it to your wishlist and watching for the next sale is a sensible approach. If you want to play right away, the NT$ 378 price is the same as the regular price, so you would be paying full value today.
Analysis written 10/28/2026 from our recorded prices; the chart above is live. Taiwan-region Steam prices.
How to Buy
- Open the Oxygen Not Included store page on Steam through the website or the Steam client.
- Note that the game is not free right now and is priced at NT$ 378 in the Taiwan store.
- If you want to wait for a better price, add the game to your wishlist.
- Turn on wishlist sale notifications in Steam settings so you hear about discounts as soon as they start.
- Buy the game through the Steam store when the price fits your budget.
- Check back here for the price trend before you make your purchase.
Things to Know
Oxygen Not Included supports English and Simplified Chinese, along with Korean and Russian, and Russian is marked as having full audio support. Traditional Chinese is not among the supported languages. The adult content flag is off for this game. Prices shown here are Taiwan-region Steam prices in NT$ and may differ in other regions. Free and discount promotions can end at any time, so check the official Steam page before you buy.
