A Cepheus Protocol Steam Key — also known as a CD Key or digital code — is the official activation code you redeem on Steam and keep in your library permanently. From €2.52 (-88%) at Eneba, 88% below the €20.49 Steam price · 5 verified stores, 7 offers in stock · Updated 01h 15min ago.
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?
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.
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.
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
Interact with rogue civilian groups. Recruit them to your cause, negotiate alliances, or defend yourself from hostile factions.
Civilian Evacuation
Manage who lives and dies with an intricate Civilian Administration Structure. Customize your intake system or use preset templates to make critical decisions.
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.
DNA Research System
Develop a proper progression tree to counter the virus, protect your units, and evolve your strategies.
Improved AI Logic
Refine the behavior of infected Lieutenants and AI to challenge extreme turtle strategies.
Co-Op Multiplayer
Share control of CERC operations with up to four players. Pool resources, coordinate tactics, and fight as a team against the infection.
Canon Campaign Mode
Experience the official Cepheus Protocol story, inspired by the novel and side storie
Cepheus Protocol for PC starts at €2.52 at Eneba, a Steam key, which is 88% under the €20.49 it costs on the official store.
That €2.52 already includes the GOCDKEYS10 coupon, so apply it at checkout or the store will show you a higher price.
Supply is thin — 7 offers from 5 stores — and thin supply keeps prices steady rather than falling.
That puts it 10% under its average of €2.80 since 2021, so today is a better entry point than most days of its life.
That €2.52 key is expensive for what it usually costs.
Worked out from 1,182 daily records of the Steam Key for Cepheus Protocol across 10 stores. See the full price history.
The price does not include each store's payment fees. The percentage is measured on the store price, without coupons, because that is how we record the history. The analysis only counts Key offers. Shared accounts, Steam Gift and physical editions stay out, because they are not the same product and their prices move differently.
The cheapest offer is already a key for your own account: €2.52 at Eneba, so there is no reason to weigh up a shared account here.
6 of the 7 offers work on US — the Global ones plus the ones issued for your own region.
One listing is worth ignoring: the Steam key that Gamivo has at €27.12 is more than 10 times the cheapest offer and is not what this game costs. The number to work from is €2.52 at Eneba.
Protocol is frustrating, annoying, and anger-inducing – I loved it! Despite the brutal and unforgiving insane A.I., who constantly kills you if you so much... Read more
Protocol is an unfocused, directionless mess of a game that tries to give too much without grasping the basics. The gameplay is frustrating, the dialogue... Read more
An absolute cluster of poorly written dialogue, terrible technical misses and infuriating puzzle mechanics, Protocol is a dreadful experience that will test your patience along... Read more
Protocol is a tortuous experience that combines clumsy, awful gameplay with an abysmal script. I would much rather fail the protocol, and be nuked, then... Read more
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