Cepheus Protocol Account
You receive login credentials to an account that already owns this game. The game is not added to your own library and the account may have usage conditions (e.g. offline mode). If you want a key to redeem on your own account, pick a non-account edition instead.
- You receive login credentials, not a key you own — sign in to the game's launcher with them to play.
- Do not change the password or email; doing so can lock you out permanently.
- The account may be reclaimed or banned by the platform, and some titles are offline-only.
- Region doesn’t apply — an account activation works anywhere.
- No refund once the login has been revealed.
Can be activated in United States
WindowsScreenshots & trailer
Buy Cepheus Protocol key
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.…
How to activate Cepheus Protocol on Steam
- 01
Buy & receive your code
Complete checkout — your code lands in your inbox in ~30 seconds, and is always available under Orders in your Gameplug account.
- 02
Open Steam
In the desktop client: top-left menu "Games" → "Activate a Product on Steam…" (or use the web link below).
- 03
Enter your key
Paste the key (format XXXXX-XXXXX-XXXXX) and accept the Steam Subscriber Agreement.
- 04
Install & play
The game joins your library permanently — install it on any machine you sign in to.
Code not working? Contact support — confirmed-invalid codes are replaced or refunded.
