Grey Goo does not list co-op on Steam; it has Online multiplayer, Single-player too.

Does Grey Goo have PvP?

Steam's store page doesn't flag a PvP category, but Grey Goo is tagged Competitive — it's player-versus-player.

Do we both need to own Grey Goo to play together?

Yes. Grey Goo is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.

How many people play Grey Goo?

About 5 players were in-game when this page's data was last refreshed (2026-09-09).

Ready Up — what game do we play?Compare two Steam libraries →

Multiplayer games › Strategy › Real-time strategy

Is Grey Goo multiplayer or co-op?

Yes — PvP. Grey Goo is a real-time strategy game released in 2015, 68% positive on Steam (4,274 reviews), with 5 playing right now. $29.99 on Steam.

Online multiplayerSingle-player tooStrategy · Real-time strategy

Fight for control of a frontier world. Gather resources, build your base, and command your forces in battle. Survive long enough to unleash your ultimate…

How Grey Goo plays with friends, according to Steam

Online co-op: Not listed on Steam
Local / split-screen co-op: Not listed on Steam
Online PvP: Not listed on Steam
LAN play: Not listed on Steam
Single-player mode: Yes
Mods: Steam Workshop

Steam's own category list for the game, as of 2026-09-09. "Not listed" means the store page does not claim that mode; community mods or Remote Play can still add it.

Steam tags: Strategy, RTS, Sci-fi, Multiplayer, Aliens, Base-Building, Great Soundtrack, Singleplayer

Do you and a friend both own Grey Goo?

Ready Up compares two Steam libraries and shows every multiplayer game you both have — including whether Grey Goo is one of them — then helps you pick tonight's game with a weighted roll or a bracket.

Or open the Steam store page.

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Tired of Grey Goo? The Swap tab finds the closest unowned games of the same type that are newer or rated higher.

Quick answers

Is Grey Goo co-op?: Grey Goo does not list co-op on Steam; it has Online multiplayer, Single-player too.
Does Grey Goo have PvP?: Steam's store page doesn't flag a PvP category, but Grey Goo is tagged Competitive — it's player-versus-player.
Do we both need to own Grey Goo to play together?: Yes. Grey Goo is played online, so each player needs their own copy on their own Steam account (or PC Game Pass where it is offered). Steam Families can share a library, but two people cannot play the same shared game at the same time.
How many people play Grey Goo?: About 5 players were in-game when this page's data was last refreshed (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 2026-09-23. Powered by Steam — not affiliated with or endorsed by Valve Corporation or Microsoft. Ready Up is a Somebody Decide program. How the data works · Legal & privacy · All types · Game Pass