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Cepheus Protocol

Game overview

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.

Sandbox Zombies RTS Survival Post-apocalyptic
Last tracked players
48
All-time peak
125
24-hour change
Unavailable
Steam reviews
79% positive
3,032 reviews · via SteamSpy

Delayed observation · last tracked . Values marked unavailable are not estimated.

About this game Read the full description

An Open World RTS Military Survival Game. Command CERC (Center for Epidemic Research and Control) to stop a pandemic-level event from consuming the Bay Area. The Pangu Virus threatens humanity as it spreads, turning native inhabitants into infected, relentless swarms. Can you adapt, survive, and reclaim control?

Hardcore RTS Military Combat Meets Survival Horror

  • Aircraft Carrier Operations
    Your mobile base of operations in Pandemic Mode. If it’s destroyed, you lose. Defend it at all costs and utilize Winters, now a rebuildable hero, to lead your forces.

  • A New Threat Rises
    Battle infected hordes that can infect and turn your own units. Command land, sea, and air forces to hold the line in this unforgiving world.

  • Co-Op Multiplayer up to 16 players in true RTS/TPS hybrid combat!
    Share control of CERC operations with up to 16 players. Pool resources, coordinate tactics, and fight as a team against the infection.

Dynamic Gameplay Systems

  • Command the Operator
    Control the battlefield in Third-Person Shooter mode or use the Operator as a hero unit in RTS mode. Adapt your strategies to survive.

  • Doctrine Tree Progression
    Unlock new support options, powerful weapons, and unique units by leveling up through the Doctrine tree.

  • Customize Pandemic Mode
    Create your perfect challenge. Turn off infected types, adjust gameplay options, and create custom scenarios to tailor the experience.

  • Character Progression
    Improve your characters’ health and targeting efficiency as they gain experience through combat.

Innovative Mechanics and Features

  • Line of Sight and Hearing AI
    Experience cutting-edge AI that hunts your units based on what they can see and hear. Stay stealthy, or face overwhelming swarms.

  • Massive, Detailed Maps
    Explore sprawling urban environments filled with varied locales. Plan every attack, defense, and civilian evacuation carefully to ensure survival.

  • Dynamic Civilian Diplomacy  (Legacy Only Coming in Q2 to rebuild)
    Interact with rogue civilian groups. Recruit them to your cause, negotiate alliances, or defend yourself from hostile factions.

  • Civilian Evacuation (Legacy Only Coming in March to rebuild)
    Manage who lives and dies with an intricate Civilian Administration Structure. Customize your intake system or use preset templates to make critical decisions.

Destroy the Infection

  • Research the Pangu Virus
    Delve into the secrets of the alien pathogen and find a way to kill Patient 0 before it’s too late.

  • Hunt Patient 0 and Their Lieutenants
    Stop the infection from spreading by targeting its leaders. Destroy their expanding hordes before they consume every province.

  • Dynamic Provincial Events
    Encounter unexpected challenges as rogue civilian combatants and infected groups form dynamically across the map. Your reputation and decisions will shape the world around you.

  • Enhanced Operator Customization
    Tailor weapons, abilities, and appearance. Drive vehicles, gain progression perks, and refine your playstyle for maximum impact.

Planned Features

  • DNA Research System
    Develop a proper progression tree to counter the virus, protect your units, and evolve your strategies.

  • Canon Campaign Mode
    Experience the official Cepheus Protocol story, inspired by the novel and side stories

Player activity

Concurrent players over the last 48 hours.

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Price history

Last 30 days ? prices in the selected region?s currency.

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System requirements Windows

Windows

Minimum

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

Recommended

Recommended:
  • Requires a 64-bit processor and operating system
  • OS: Windows 10/11 (64-bit)
  • Processor: Intel® Core™ i7-6770K / AMD Ryzen 5 1500X
  • Memory: 16 GB RAM
  • Graphics: NVIDIA GeForce 2060 GTX or AMD Radeon Equivalent 6GB VRAM
  • DirectX: Version 12
  • Storage: 8 GB available space
  • Sound Card: Direct X Compatible
  • Additional Notes: **recommended SSD install for optimal performance
Game details Languages, features & support
Publisher
Halcyon Winds
Brazilian rating
14
Steam Germany rating
16
Achievements
5
Controller support
partial
Features
Single-player, Multi-player, MMO, Co-op, Online Co-op, Steam Achievements, Steam Trading Cards, Steam Workshop, Adjustable Text Size, Camera Comfort, Custom Volume Controls, Adjustable Difficulty, Playable without Timed Input, Save Anytime, Stereo Sound, Surround Sound, Partial Controller Support, Steam Cloud, Remote Play Together, Family Sharing
Languages
English*, Simplified Chinese, Korean, German, Japanese, Russian, Spanish - Spain, Portuguese - Portugal, French
*languages with full audio support
Compatibility & accessibility Steam Deck, controllers & access features

Can I Play This?

Steam declarations and Valve's Steam Deck compatibility result. Missing data is shown as unknown, never unsupported.

Sources fresh
Native Steam builds
Windows: unknown
macOS: unknown
Linux: unknown
Steam Deck
playable
Valve compatibility test
The on-screen keyboard may need to be opened manually.
Input
Controller support: unknown

Developer-declared accessibility on Steam

Features not declared by the developer are not labeled unsupported.

adjustable text size camera comfort custom volume controls stereo sound surround sound playable without timed input adjustable difficulty save anytime
Structured language support (9)
LanguageInterfaceFull audioSubtitles
EnglishYesYesNo
Simplified ChineseYesNoNo
KoreanYesNoNo
GermanYesNoNo
JapaneseYesNoNo
RussianYesNoNo
Spanish - SpainYesNoNo
Portuguese - PortugalYesNoNo
FrenchYesNoNo

Third-party requirements shown by Steam

Requires agreement to a 3rd-party EULA Cepheus Protocol EULA
Steam store page fresh · checked 2026-11-01 PCGamingWiki technical notes External link only; SteamIQHQ does not ingest PCGamingWiki content.
More analysis Activity patterns, updates & developer tools

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Game Insights

Buy Verdict

Wait — $19.99.

Wait for upcoming sale in ~13 days for potentially better pricing.

▬ ~13 days until next sale

Value Score

Great Value — 80th percentile.

Price-to-player ratio ranks in the 80th percentile. Priced as Market at $19.99.

▲ Market pricing tier

Genre Benchmarks

Player Count Top 33%
Value Ratio Top 20%

Early Access Active

Time in EA
267 days
Current Players
48

Activity Heatmap

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Avg Activity
13
Active Hours
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Developer Analytics

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Frequently Asked Questions

Is Cepheus Protocol worth buying right now?
Wait — $19.99. Wait for upcoming sale in ~13 days for potentially better pricing.
When does Cepheus Protocol go on sale?
Wait for upcoming sale in ~13 days for potentially better pricing.
Is Cepheus Protocol free to play?
Cepheus Protocol costs $19.99 on Steam.
What genre is Cepheus Protocol?
Cepheus Protocol is a Action, Adventure, Indie, Massively Multiplayer, RPG, Simulation, Strategy, Early Access game.
Who developed Cepheus Protocol?
Cepheus Protocol was developed by Halcyon Winds and published by Halcyon Winds.
What platforms does Cepheus Protocol support?
Available on Steam for Windows.

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