Oxygen Not Included is a space survival simulation game developed by Klei Entertainment. Players control Duplicant characters to build and maintain an underground colony on a mysterious asteroid.


The game begins with three Duplicants waking up on an asteroid with limited breathable air pockets, with no memory of how they got there. The player's mission is to manage the Duplicants' oxygen, food, temperature, and psychology to ensure their survival and development.

The base building system allows players to control everything from mining, resource allocation to the plumbing and electrical systems. Resources will be depleted from the very first breath, so fast digging is the key to survival.

The stress simulation system requires players to maintain the Duplicant's morale through entertainment activities, good housing, and delicious food. Each Duplicant reacts to stress differently, which can cause serious consequences if not managed well.

Temperature control is a continuous challenge – too cold will freeze, too hot will burn. Players need to monitor the ambient temperature and the colony's heat production to maintain a warm atmosphere for the inhabitants.

The complex gas and liquid simulation system allows the creation of interconnected pipeline networks to transport fuel and liquids to critical areas. Good planning will turn the colony into a smoothly operating machine.

The power grid system supplies multiple energy sources including coal, hydrogen, natural gas, or manual labor. Managing electricity leakage, circuit overload, and faults to keep the colony operating stably.
Oxygen Overlay allows monitoring the airflow moving through the facility in real time. Monitoring carbon dioxide accumulation and monitoring the oxygen generation process to turn the colony into a true space oasis.

The extreme recycling system helps utilize all resources. Recycling waste into valuable fuel, treating unbreathable gases into air, or exploiting the biological processes of wildlife to make food.
DLC Spaced Out! expands the experience with multi-world gameplay, allowing management of multiple colonies simultaneously. Players can explore new asteroids, transport resources between facilities, and build modular rockets to explore space.

The world is randomly generated with many different biomes containing characteristic materials and creatures. Each new playthrough brings a different experience with unique challenges and opportunities.