Cepheus Protocol is an independently developed top-down RTS inspired by XCOM, Company of Heroes, and Parasite Eve.

A lethal virus has infected Treasure Island, San Francisco and it is up to Captain Winter, a U.S. Army soldier working with the Center for Epidemic Research and Control (CERC) to stop the mysterious and deadly Pangu Virus from spreading to the mainland.

In Cepheus Protocol, you control the fate of a whole city. Every choice you make matters as you must decide how it is best to combat the pandemic. Will you firebomb and leave no trace of human life behind? Or will you try and save everyone at the cost of your squad's safety? Featuring a full day and night cycle, the world changes with each new day as the virus evolves, making the infected more dangerous by the minute.

Building bases, recruiting new soldiers, and sending teams out in the field to battle the growing virus, all the while hunting down Patient Zero is the primary goal of the CERC. With replayability and challenging gameplay at its core, players must be mindful of the environment and the changing nature of the battlefield. Each soldier's loss is a man not easily replaced.

You'll have to use all the tools in your arsenal to research the plague and seek out Patient Zero, whose mastery over the virus grows with each victim she infects. Stopping her is paramount, or a city of millions could be lost.

  • View media
  • View media
  • View media
  • View media
  • View media
  • View media
Post article RSS Articles

Game Beats

A lethal virus has infected Treasure Island, San Francisco. It is up to Captain Winter, a U.S. Army soldier working with the Center for Epidemic Research and Control (CERC), to stop the mysterious and deadly Pangu Virus from spreading to the mainland. The Cepheus Protocol is an independently developed top-down RTS inspired by XCOM, Company of Heroes, and Parasite Eve.

Wishlist Us or Join our Community!

The Good, Bad and the Ugly

Over the past 3 months we've been working to polish up and refine CP quite a bit. From long term UI revamps like our proposed new main menu layout, balancing doctrines, working around the restrictions built into the engine for larger open world RTS games and more I will in a sense update you folks on what we accomplished and what we will be working on going into 2021.

Halloween Event:

We also did a little Stream on Halloween check it out!

Halloween Q&A

We had quite a few technical issues but here is the full replay from our Halloween Stream!

Cepheus Protocol Dev Update #3 and 4 Month in Early Access Overview: We are working on several trailers and newer dev videos at the moment stay tuned!

Wiring System/Generator Revamp:

Currently we are working to finalize our wire/power system based on feedback from our community of what they want to see. Generators will have a pool of "available power". That power will be affected by how many nearby units you link into the grid. The grid can be expanded and shared across bases + you can now build power bases and have more control over how your bases look going in this direction. You simply will engage a wiring mode that will allow you to tether buildings together as seen below!

ROE Expansion Custom Game Mode: We constantly engage and talk with our community on what they wanted to see and started pushing more user friend approaches for managing artillery and more. Like for example you can now map mortars and other types of artillery to cards/squads and have easier access to manage them. More changes are coming to make them more viable quality of life wise like a buff to their damage towards pods but they will require ammo to balance out their devastating impact they have on the battlefield.

ROE and more toggles were added based on suggestions and things we deemed would help quality of life. Quite a few might be omitted here because the list so so vast so double check trello or the official patch notes for more information on this front.

A highly requested feature is to disable laser sights for those wanting a more immersive experience.

Mortar's will now flag where they are firing at to help reduce friendly friend you can toggle this on and off in the ROE tab

Things like the Grenade Launcher and Javelin were tweaked to allow you to tweak safety distances in the ROE of how close allied units can be to allow them to fire and more!

Doctrines Status:

We got some feedback about the balancing of the new doctrines and are tweaking their balance going into XMAS we hope to have them out of beta with the open world right before Christmas.

Apache a new addition to the doctrine trees

We experimented and setup a lot of modular systems which took a while but in the future will allow modders to create their own doctrines. Some teasers of the new abilities go try out the "Public beta" on steam if your feeling adventurous!

Was quite a complicated setup to get working but we feel it will add a lot in the long term by via of replayability when we start to put a laser focus on pushing modding going into the new year.

We added whole new approaches to playing the game via the three new doctrines.

Leviathan and Little Guys:

It is my belief that the Levitation and his army as it stands is a completely devastating force that will if not implemented correctly completely cripple the game. He can travel under the map and emerge anywhere when damaged to a certain threshold and not killed he will retreat underground and heal coming back with a vengeance in the future, Chesley can research and start to build them after day 2 and they wil be her front line harass unit and currently we plan to allow 3 max. He can spawn smaller creatures that he shakes off his scales in the dozens that will swarm and easily out number most combat teams. Thus why we waited for Doctrines to ship and after a bit more polish he'll be introduced with the juggernaut to put CERC back in their place.

On the Topic of Infected Creatures & new Structures:

We do plan on adding more infection types currently as noted above the Levitation and his Little Guys will be added then shortly after the Juggernaut. We have other designs and ideas in the works but i cant disclose them yet

I can confirm we are working on more defense structures, adding more VFX to the current one and pushing the polish to the current defense towers she can grow. We will also be adding a organic barricade she will be able to grow see pictures below! ^_^

Open World Update:

Over the course of development during the last few months we discovered several issues relating to the engine and how it losses accuracy of Deprojections data from a mouse click to the world once you exceed 100,000 UU from 0,0,0 in the local world. I.E selections of units will be offset and horrible

The Problem:

With the direction we attempted previously having 4 zones with their real world geographical distances it ended up being a little to much. My thing thing on design was basically no loading screens i want a seamless experience from start to finish. You can pickup your units and travel without having to wait. So we rethought our approach...

The Solution:

We tried several methods to work around this restriction but decided it was in our best interest not to override these safeties or rather optimizations placed into the engine and instead use it as a hard restriction of this newly formed box of 100,000 in every direction from 0,0,0 as a hardcap of how larger we can build our worlds and for modders in the future.

The various versions we toyed with internally.

The final version we went with below! It should be noted we actually kept the center island as "Treasure Island" but the side support islands are being rebranded and renamed . In the foreseeable future we'll cover the San Francisco Mainland

See the yellow line as an example of exactly 100,000 from the red dot of 0,0,0. The purple box was an expanded region we were able to expand the overall map size from some tracing tricks.

So one crisis averted what else did we do or rather plan out next?

Tutorial Revamp:

Over the course of finalizing aspects of gameplay we have started working towards implementing a new tutorial visual AID and a new updated tutorial. This will be implemented in the near future to make newer players path of entry into the game far simpler and explain the more complicated differences between our game and others of the genre.

Below is the revised tutorial girl that will talk to you throughout gameplay and be your point of contact during the Pandemic mode.

Revised Winters ingame model + Cutscene Model

Woa there... What about Factions you say?!:

As many of you know COVID and a recent data failure caused use to reevaluate our deadlines going into December. We used this extra time instead to polish and work on what was doable and reevaluate our overall schedule. All of the faction models in question have been remade, backed up and are already actually shipped content wise (Preloaded) into your game. Its just not enabled baring quite a few systems of the faction system need to be coded as all modeling is done for the first pass of release.

Natalie Washington - Anarchists Faction Leader

Version 1

Version 2

Pierce ( Police Faction Leader)

Police Variant NPC

Normal beat Cop Version

So What's Next Then?!:

As it stands we are implementing the following changes up to May 15, 2021. See trello for more details should anything be updated here Trello.com

  1. Generator System/Power Revamp
  2. Open World/Doctrines leave public beta
  3. Juggernaut
  4. Levitation & Little Guys
  5. Factions
  6. Ultra Polish
  7. Coop
  8. Modding (mod.io implementation)

Cepheus Protocol - Horde AI improvements and more!  - Dev Update #38

Cepheus Protocol - Horde AI improvements and more! - Dev Update #38


Over the last few weeks we've worked to improve the infected, optimization and take feedback from the community to ensure we are hitting all the right...

Cepheus Protocol - Out Now on Steam - Dev Update #37

Cepheus Protocol - Out Now on Steam - Dev Update #37


Dev Update #37 A large blog update to cover the past few weeks of releases.

Cepheus Protocol FAQ/Roadmap Update

Cepheus Protocol FAQ/Roadmap Update

News 1 comment

This article is a roll-up of all the major systems compiled into one thread for convenience for all those curious of what we are working on over the next...

New Content: Early Access Out Now - Dev Update #36

New Content: Early Access Out Now - Dev Update #36

News 1 comment

After our Early Access release, we're excited to be sharing a lot of the new content we've added in and what we're planning to release in the coming weeks...

Comments  (0 - 10 of 16)

This game is already on my Steam Wishlist :) It is one of my most desired games. Already planning on buying it for my brother as a Christmas gift
This game is something we all wished for, a breath of fresh air for the genre. Keep up the good work team!

Reply Good karma Bad karma+1 vote

Amazing progress thus far! Hope to see more in the future, i do however have a question. What purpose does a unit's rank serve? Higher damage? More Hp. Or more abilities. It would be cool to have recruits become Veterans later on maybe with a slightly different look to them to differentiate them.

Reply Good karma Bad karma+1 vote
Dark583 Creator

Target Acquisition time goes down, gains health & the chance of missing is reduced , like in the game world yes?

Reply Good karma+2 votes

Thank you for replying, now i know how it will affect soldiers more, i just hope that the promotions, if a soldier stays alive for long to get them, do make a impact but not enough to be OP

Reply Good karma Bad karma+2 votes
Dark583 Creator

They dont ever become OP anyone can die quite easily with a bad order given!

Reply Good karma+2 votes

On the formations in the first nest near your base i have been having the issue where the soldiers if to many will teleport back a few feet and not engage any targets though they are looking right at them not sure if any one else has had this issue. i gave up on the second game after i figured i would charge in get more spacing but only 4 members out of 16 were actively shooting and every one had just topped off on ammo. after the commander when down while trying to retreat i gave up.

Reply Good karma Bad karma0 votes
Dark583 Creator

Odds are you were moving a defense team outside an owned territory, your welcome to join our discord contact "Dark" the project lead and he'll personally help you out!

Are you sure they were facing the right direction? As formation and placement matter. This isnt the typical RTS where they knows everything within a circle they have to actually"See" and "Hear" the enemy

Reply Good karma+1 vote

Will be better if can make it as fps.

Reply Good karma Bad karma-1 votes

The game feel unique because it's a strategy game, you already got plenty of fps/tps zombie game just play Dying Ligth or Prototype or any of the gazilion fps and tps zombie game.

Reply Good karma Bad karma+1 vote

Weapons and crafting, Jagged Alliance had that in spades, this could be waaay better than that with the nice graphics. Also please have a deep lore

Reply Good karma Bad karma+1 vote
Post a comment
Sign in or join with:

Only registered members can share their thoughts. So come on! Join the community today (totally free - or sign in with your social account on the right) and join in the conversation.


Latest tweets from @cepheusprotocol

On the Eve of New Years our team would like to share our final 2021 sizzle trailer Youtu.be

Dec 30 2021

Winter Sale Update: - ( Happy Holidays ) We're also on sale for 22% off on Steam at the moment! * Tons… T.co

Dec 22 2021

Cepheus Protocol Dev Update #10 Youtube.com

Dec 6 2021

Our next developer video will be premiering at 9:30 PM PST. Watch it live here! (18 minutes from now! ) Youtube.com

Jul 22 2021

Cepheus Protocol is now 25% off for the Steam Summer sale Store.steampowered.com T.co

Jun 24 2021

Join our Discord for the latest! Discord.gg

May 15 2021


May 15 2021

Cepheus Protocol Dev Update #5 A catchup on Year 1 Content Youtube.com

Apr 6 2021

We are 20% off for the Lunar New Year Store.steampowered.com

Feb 12 2021

Sunday Dev Stream playtesting Build | Jump in Hangout! Starting Soon Twitch.tv

Jan 31 2021