

PC (Microsoft Windows)
Cepheus Protocol
#Real Time Strategy (RTS)
About
Find patient zero before an alien virus takes over San Francisco and the cepheus protocol is enacted. Command your squad, save civilians, and stop the Pangu virus. Kill patient zero and save the world.
Storyline
Cepheus Protocol is an open world RTS military survival game. You play as CERC, hunting Patient Zero while keeping quarantine camps alive. Hold the line against brutal mutations and rogue civilian combatants. No reinforcements. No backup. It is on you.
Playtime Estimates
Main Story-
Main + Extra-
Completionist2.3h
All Styles2.3h
Confidence: 100%Updated: 9/20/2026
Live Prices & Deals
Current store offers for selected market.
Source: No offers
Multiplayer
Online Max16 players
Online Co-opYes
Languages
| Language | Support |
|---|---|
| English | Audio |
| Chinese (Simplified) | Interface |
| Korean | Subtitles |
| German | Subtitles |
| Russian | Interface |
| French | Interface |
| English | Subtitles |
| Chinese (Simplified) | Subtitles |
| Japanese | Subtitles |
| Spanish (Spain) | Interface |
| French | Subtitles |
| English | Interface |
| Korean | Interface |
| German | Interface |
| Japanese | Interface |
| Spanish (Spain) | Subtitles |
| Russian | Subtitles |
| Portuguese (Portugal) | Interface |
| Portuguese (Portugal) | Subtitles |
| Portuguese (Brazil) | Interface |
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Game Info
Release Date5/15/2020
DeveloperHalcyon Winds
PublisherHalcyon Winds
PlatformsPC (Microsoft Windows)
GenresReal Time Strategy (RTS), Simulator, Strategy, Adventure, Indie
Game Modes
Single player
Multiplayer
Co-operative
Themes
Action
Survival
Release Dates
PC (Microsoft Windows)May 15, 2020