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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. Data as of 2026-05-20.
“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 count fetched 2026-07-11 13:09 UTC · history 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 2026-07-25.
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 (2026-07-24). 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.
World Reveal of CERC Ops This Saturday!
A New Way to Monitor the Battlefield This Saturday, during the 100th episode of CERC HQ , we will hold the world reveal of CERC Ops , a new tactical companion built specifically for Cepheus Protocol.
Massive Performance Gains and Smarter Fog of War Are Coming
These transmissions come directly from the front. The battle for the Bay Area has begun. Core Improvements and Community Audit As outlined during CERC HQ on Saturday, we are continuing to refine the c
2026.7.11 AI, Performance & Helicopter Systems Update on Experimental
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones.CERC forces are already in
2026.6.19.5 Discord Integration Fixes + Launcher
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula as entire districts fall into chaos and infected swarms push deeper into civilian zones.CERC forces are already in
2026.6.18.2 Weather System, Discord, Vehicles, and Pandemic Fixes
The virus is loose across the Bay Area. Flashpoints are erupting across the peninsula 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 2026-05-20.
| 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 |
| Estimated owners | 200,000 – 500,000 (SteamSpy) |
| 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