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The Oxygen Not Included: Multiplayer Mod is an exciting fan-made addition that transforms the beloved solo space colony simulator into a cooperative multiplayer experience. This mod lets multiple players share control of a single colony, working together to manage oxygen levels, resources, duplicants, research, and base building in the harsh environment of an alien asteroid. If you ever wished to team up with friends for strategic planning and shared survival challenges, this mod offers that exact cooperative gameplay, making Oxygen Not Included a social and chaotic engineering adventure. Although still in development and released as an early work-in-progress, it supports synchronized menus and gameplay mechanics, allowing players to join via Steam overlay, invite friends, and control different parts of your digging and base management simultaneously. For fans of colony sims hungry for multiplayer interaction, this mod is an invaluable way to experience the intense micromanagement and science mastery of ONI together.
What Is Oxygen Not Included and Why Multiplayer?
Oxygen Not Included, developed by Klei Entertainment, is a single-player simulation game where players manage a colony of duplicants trapped inside an asteroid. The goal is to keep your colonists alive by managing scarce resources like oxygen, food, and water while tackling environmental hazards. The base-building, research trees, and complex gas/liquid simulation have made it wildly popular among fans of intricate strategy and survival games. However, officially ONI remains a single-player sandbox, with no built-in multiplayer or co-op modes. This is where the multiplayer mod shines by enabling co-op gameplay that lets friends cooperate on one colony or even oversee different asteroids at the same time.
Features and Gameplay of the Multiplayer Mod
The mod includes features such as:
- All players share equal control over one colony; any player’s command can be overridden by another, encouraging teamwork or fun friendly chaos.
- Supports synchronized UI elements like settings, priorities, schedules, and research trees across players.
- Displays active player cursors and info to facilitate coordination.
- Periodic hard syncs prevent simulation divergence on different machines.
- Supported for vanilla ONI without currently integrating DLC content.
- Steam integration allows easy invite and join experiences.
While still marked as Early Access and a proof of concept, this mod provides a robust foundation for multiplayer colony management in ONI.
How To Install And Play The Mod
- Download the latest release from the mod’s official GitHub repository.
- Install it by running the included installer or manually copying files into your ONI mods folder.
- Host games via the mod’s multiplayer menu; wait for friends to join through Steam overlay invites.
- Join games by accepting invites or selecting join options within the mod’s menu.
- Communicate with your team to coordinate duplicant tasks, base building, and research priorities.
Is Official Multiplayer Coming?
As of now, Klei Entertainment has not announced official multiplayer support for Oxygen Not Included. The mod remains the go-to multiplayer option while the community pushes the boundaries of this single-player classic.
Where To Play Oxygen Not Included
For the official single-player experience, purchase and download Oxygen Not Included on Steam:
Play “Oxygen Not Included” now:
https://store.steampowered.com/app/457140/Oxygen_Not_Included/
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