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Cepheus Protocol
Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue Civilian Combatants . There’s nobody else coming, it’s up to you now.
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-02 · quoted reviews as of 2026-05-12.
What reviewers agree on
63 of the 104 reviews raise this.
“This is a strange one - Steam reckons this game was released 6 years ago but its not once popped up as a recommendation, despite the fact i have played pretty much every RTS/Base builder there is, including Rimworld and…”
“See the TLDR at the bottom With an engine change, total overhaul, optimizations, and a 3rd person operator mode which really shows off the eye candy and puts you in it, this game has cocooned itself from the pudgy worm…”
“Devs are hard at work on the game and it's coming along nicely. The devs are catching flak since progress seems slow since they had to rebuild the game over again. Cut them some slack. This is not a AAA dev with huge…”
30 of the 104 reviews raise this.
“See the TLDR at the bottom With an engine change, total overhaul, optimizations, and a 3rd person operator mode which really shows off the eye candy and puts you in it, this game has cocooned itself from the pudgy worm…”
“Devs are hard at work on the game and it's coming along nicely. The devs are catching flak since progress seems slow since they had to rebuild the game over again. Cut them some slack. This is not a AAA dev with huge…”
“this is one of the best RTS games ive played in a long time even though there are some sad bugs such as units refusing to shoot and enemy ai getting glitched attacking nothing the game is hella fun to play with friends…”
7 of the 104 reviews raise this.
“this is one of the best RTS games ive played in a long time even though there are some sad bugs such as units refusing to shoot and enemy ai getting glitched attacking nothing the game is hella fun to play with friends…”
“They are cooking. I see truly great potential ahead. Especially as they are producing one of the most co-op focused experiences as of the new build ive seen in a long time. And its a game thats hard, in a world of…”
“As one of the players who is getting part of the playtest, there are two games. The old build and the new build. The old build is STILL accessible under betas. And it's fully serviceable as the old version you use to…”
7 of the 104 reviews raise this.
“I would recommend it to other players. but...... It needs an update like balancing the game like you can have Elite Team that can enter the Toxic Gas of an Infection Zone which they are immune, resistance skin and add…”
“Go to betas and play the legacy version first, much more content complete than the current WIP version that is automatically installed. Very promising game though so far.”
“Zombie RTS games can be a bit hard to find and ive never seen one that is based fully around the outbreak. The game is still being worked on and I like what they have shown so far. Coop is a tad clunky but still fun to…”
6 of the 104 reviews raise this.
“It's a pretty fun game at first had some issues and little bit delay but ever since they started rework or rebuild they been adding to it improving game a lot and making it better whole doctrine tree was redone they…”
“I frequently see an issue with Steam reviews where they fail to consider the concept of "investing" in a game in it's early stages. Too many times you see "is this worth the money?" followed by "well if you're looking…”
“Gelecek vaat eden bir oyun. Arkadaşlarla daha eğlenceli olucak ilerde. Ben olsam alırdım çünkü oyun ilerde 20 dolar olursa şaşırmam. Hakkını veren bir oyun. Ama şuan her şey baştan yapılıyor diye yorumladım. Bir ay…”
30 of the 104 reviews raise this · 19 of them still recommend the game.
“The game is missing at least 1/3 of what it shows in the trailer, primarily the civilian evacuation. Also provides no tutorials, has a weird operator system but it seems promising as for some reason they're rebuilding…”
“Edit: Lmao the devs are mass replying to every actually negative review with paragraphs of gaslighting - I leave the below for posterity, but I amend my advice to DO NOT BUY as an absolutely, they're being incredibly…”
“Has a lot of potential but also a lot of bugs. Optimization is something I'll pray for everyday. I'll revisit in the near future, but at this time, I feel like I'm playing a modded Wargame without the great mechanics…”
26 of the 104 reviews raise this · 8 of them still recommend the game.
“Okay, the dev decided to sack up and respond to this review. So here's some *real feedback* for you. First off let me address your fans on cope: Real life isn't anime. Being an emotionless, worthless drone, is not…”
“Geniunely wish I could ask for a refund. I check into this game about every year or so, and somehow it's less complete every time or has more half-baked ideas that ultimately make the game more frustrating than fun.…”
“Pretty negative experience overall. The biggest problem to me is the lack of a proper tutorial. I had to watch a YouTube video just to understand the basics, which is a big oversight for a game that’s been in Early…”
17 of the 104 reviews raise this · 5 of them still recommend the game.
“Okay, the dev decided to sack up and respond to this review. So here's some *real feedback* for you. First off let me address your fans on cope: Real life isn't anime. Being an emotionless, worthless drone, is not…”
“Geniunely wish I could ask for a refund. I check into this game about every year or so, and somehow it's less complete every time or has more half-baked ideas that ultimately make the game more frustrating than fun.…”
“The game is missing at least 1/3 of what it shows in the trailer, primarily the civilian evacuation. Also provides no tutorials, has a weird operator system but it seems promising as for some reason they're rebuilding…”
15 of the 104 reviews raise this · 8 of them still recommend the game.
“Geniunely wish I could ask for a refund. I check into this game about every year or so, and somehow it's less complete every time or has more half-baked ideas that ultimately make the game more frustrating than fun.…”
“Pretty negative experience overall. The biggest problem to me is the lack of a proper tutorial. I had to watch a YouTube video just to understand the basics, which is a big oversight for a game that’s been in Early…”
“The game is missing at least 1/3 of what it shows in the trailer, primarily the civilian evacuation. Also provides no tutorials, has a weird operator system but it seems promising as for some reason they're rebuilding…”
12 of the 104 reviews raise this · 10 of them still recommend the game.
“I want to recommend this game as it has so much promise, but the game is very infuriating. I understand the game is a work in progress and was rebuilt, but pathing is pretty annoying. I found myself in several instances…”
“Hunt down the refund, game makes no sense, after years of "development there is still no story mode or any date on when the game is gonna be finished. The game is confusing to learn and very punishing on new players.…”
“This has great potential. I'm definitely going to follow it and stick with it as it grows. Its got some balancing issues. I wish there were more in terms of goals, missions, objectives, or something instructing you or…”
Counted across 104 English reviews, sampled to match this game's 75.4% positive rating · as of 2026-05-12
“TLDR: Buy now? No Buy in the next six months: Maybe Buy in a year: Yes It's an early access game it's had a rough development cycle and only really in the last 1.5 years and have the devs actually started refining the game. choosing to rebuild the game from the ground up, moving…”
— a player, Steam review · 45 hrs played“For all the negative votes, you didn't read the important pop up note on the right side of the main menu stating to play the 'Legacy Version' if you want to "grasp the direction the game is heading". The version that is uploaded right of the bat is the new game being built from…”
— a player, Steam review · 85 hrs played“[code]This game would be a dream come true for me, but sometimes you have to face the facts: it's a 6 year old game with bugs, glitches, unfinished maps, unfinished builds, buttons on the UI that dont function, awful sound design and an achievement you cant get because there's…”
— a player, Steam review · 12 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-06 via SteamCharts.
Achievement stats
Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-05.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-04). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
2026.9.4 Experimental Patch Notes & September Development Update
The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in
2026.8.21.1 Experimental Patch Notes & August Development Update
The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in
2026.8.13.1 All Branches
The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in
2026.8.4.1 + 4.2 Experimental and Normal Patch Notes
The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in
2026.7.31.3 Quality of Life Update Live + GPU Fog of War Tonight on Experimental
The virus is loose across the peninsula. Flashpoints are erupting across the region as entire districts fall into chaos and infected swarms push deeper into civilian zones. CERC forces are already in
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-12.
| Genres | Action, Adventure, Indie, Massively Multiplayer, RPG, Simulation, Strategy, Early Access |
| Player tags | Sandbox · Zombies · RTS · Survival · Post-apocalyptic · Building · Strategy · Gore · Open World · Singleplayer · Diplomacy · Indie (SteamSpy community voting) |
| Features | Single-player · Multi-player · Co-op · Online Co-op · Steam Achievements · Steam Trading Cards · Steam Workshop · Adjustable Text Size |
| Languages | English * , Simplified Chinese, Korean, German, Japanese, Russian, Spanish - Spain, Portuguese - Portugal, French * |
| Achievements | 5 |
| Official site | https://cepheusprotocol.com/ |
Minimum system requirements (PC)
Minimum: Requires a 64-bit processor and operating system OS: Windows 10/11 (64-bit) Processor: Intel® Core™ i5-4500K Memory: 8 GB RAM Graphics: NVIDIA GeForce 1060 GTX or AMD Radeon Equivalent 4 GB DirectX: Version 12 Storage: 8 GB available space Sound Card: Direct X Compatible Additional Notes: **recommended SSD install for optimal performance