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Is Oxygen Not Included multiplayer? Yes — with Oxygen Not Included Multiplayer

Not out of the box — but the Oxygen Not Included Multiplayer mod makes it co-op. Oxygen Not Included is a builder & management game released in 2019, 97% positive on Steam (128,390 reviews), with 7,545 playing right now. $24.99 on Steam.

Co-opSingle-player tooMultiplayer via mod: Oxygen Not Included MultiplayerStrategy · Builder & management

How to play Oxygen Not Included with a friend: Oxygen Not Included Multiplayer

Shares one colony between players. Playable and improving, but expect desyncs on big bases. Steam lists Oxygen Not Included as single-player, so it won't show up in Steam's own "games we both own" view as something you can play together — Ready Up counts it anyway, marked "Via mod", and you can hide mod-only games with one filter if that's not your thing.

Players
2+
Modes
co-op
Status
Beta — playable, rough edges, expect bugs
You need
One host; Steam or direct connection
Price
Free

Get Oxygen Not Included Multiplayer All 77 games with multiplayer mods →

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…

Steam tags: Colony Sim, Base-Building, Survival, Resource Management, Building, Singleplayer, Management, 2D

Do you and a friend both own Oxygen Not Included?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Oxygen Not Included is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

Do you and a friend both own Oxygen Not Included?Free, no login — uses public Steam profiles.

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Tired of Oxygen Not Included? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Oxygen Not Included co-op?
Not natively. Oxygen Not Included ships single-player; the community mod Oxygen Not Included Multiplayer adds co-op — Shares one colony between players. Playable and improving, but expect desyncs on big bases.
Does Oxygen Not Included have PvP?
Only with the Oxygen Not Included Multiplayer mod, which is co-op only.
How many people play Oxygen Not Included?
About 7,545 players were in-game when this page was built (2026-09-09).

Ready Up is a free tool: enter two Steam usernames and it lists the multiplayer games you both own, runs a bracket to pick one, and suggests new co-op games that fit how you both play. Ratings, tags and player counts from Steam and SteamSpy; page updated 2026-09-09. Powered by Steam — not affiliated with or endorsed by Valve Corporation or Microsoft. How the data works · Legal & privacy · All types · Game Pass