Is Cepheus Protocol co-op?

Yes, Cepheus Protocol supports co-op.

Does Cepheus Protocol have PvP?

Steam does not list PvP for Cepheus Protocol.

Do we both need to own Cepheus Protocol to play together?

Not always. Cepheus Protocol supports Steam Remote Play Together: one person who owns it hosts and streams a local session to friends who don't (Steam quotes up to four players, more on a fast connection). For online co-op or PvP, every player needs their own copy.

How many people play Cepheus Protocol?

About 20 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 › Survival › Zombie survival

Is Cepheus Protocol multiplayer or co-op?

Yes — co-op. Cepheus Protocol is a zombie survival game released in 2020, 79% positive on Steam (3,032 reviews), with 20 playing right now. $19.99 on Steam.

Co-opSingle-player tooSurvival · Zombie survival

Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue…

How Cepheus Protocol plays with friends, according to Steam

Online co-op: Yes
Local / split-screen co-op: Not listed on Steam
Online PvP: Not listed on Steam
LAN play: Not listed on Steam
Remote Play Together (one copy, streamed to friends): Yes
MMO: Yes
Single-player mode: Yes
Controller: Partial controller support
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: Sandbox, Zombies, RTS, Survival, Post-apocalyptic, Building, Strategy, Gore

Do you and a friend both own Cepheus Protocol?

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

Or open the Steam store page.

Games like Cepheus Protocol you can play together

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Project Zomboid

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7 Days to Die

Zombie survival · 89% positive on Steam (370,046 reviews) · 17,045 playing right now

Unturned

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SCUM

Zombie survival · 75% positive on Steam (112,115 reviews) · 8,535 playing right now

State of Decay 2: Juggernaut Edition

Zombie survival · 83% positive on Steam (62,716 reviews) · 1,281 playing right now

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

Quick answers

Is Cepheus Protocol co-op?: Yes, Cepheus Protocol supports co-op.
Does Cepheus Protocol have PvP?: Steam does not list PvP for Cepheus Protocol.
Do we both need to own Cepheus Protocol to play together?: Not always. Cepheus Protocol supports Steam Remote Play Together: one person who owns it hosts and streams a local session to friends who don't (Steam quotes up to four players, more on a fast connection). For online co-op or PvP, every player needs their own copy.
How many people play Cepheus Protocol?: About 20 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