Single-player games like Cepheus Protocol
Below are 10 single-player Steam games similar to Cepheus Protocol, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Cepheus Protocol page.
Ranked picks
- 1
Infection Free Zone
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Strategy with Cepheus Protocol.
Choose any real region from the world. Choose your base of operations, then rebuild and readapt the buildings around you to create a self-sustaining settlement. Take charge of a group of survivors from your city. And when the night falls - Defend the zone from the infected!
- 2
Survivalist
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Strategy with Cepheus Protocol.
It's one year after the collapse of civilization and self-centered hedge fund manager Joe Wheeler emerges from his specially constructed bunker in search of food. This is a huge open-world RPG where you have the freedom to play how you want - but your choices have consequences.
- 3
Atom Zombie Smasher
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Strategy and Indie with Cepheus Protocol.
The zombie apocalypse is upon us and it's up to you to evacuate everyone before they fall prey to the undead. Conduct massive rescue operations with a helping hand from snipers, artillery crews, orbital bombardments, and more.
- 4
They Are Billions
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Strategy with Cepheus Protocol.
They Are Billions is a Steampunk strategy game set on a post-apocalyptic planet. Build and defend colonies to survive against the billions of the infected that seek to annihilate the few remaining living humans. Can humanity survive after the zombie apocalypse?
- 5
State of Decay 2: Juggernaut Edition
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Simulation with Cepheus Protocol.
The dead have risen and civilization has fallen. Now it's up to you to gather survivors, scavenge for resources and build a community in a post-apocalyptic world – a world where you define what it means to survive in this ultimate zombie survival simulation.
- 6
Delivery from the Pain:Survival / 末日方舟:生存
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Strategy with Cepheus Protocol.
You'll play as a survivor in a world overrun by zombies. Explore and interact with other survivors, making tough choices about whether to help or exploit them. Defend against zombies, collect resources, craft, and fortify your shelter. Use strategy to escape this world and return to safety.
- 7
Final Outpost: Definitive Edition
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Strategy and Simulation with Cepheus Protocol.
Final Outpost is a survival strategy base-builder. You lead the last survivors of the apocalypse. Assign roles, craft tools, and manage resources carefully. Construct buildings, level up your citizens, and fortify your town against hordes of zombies. How many days can you survive?
- 8
Contagion
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol.
Contagion isn't your average Zombie Shooter but instead takes a more realistic and different approach to the popular genre with unique characters, environments, weapons, items, and a built in system that makes every round completely unpredictable with resources, objectives, and paths ever changing.
- 9
Legacy
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Strategy with Cepheus Protocol.
Legacy is open world of exploration, survival, crafting and city building. Start as a primitive and naked man or woman and build your character and tribe. You will pass traits on to your offspring and losing a tribe member in battle can have serious consequences. Your decisions will be your legacy.
- 10
Cepheus Protocol Anthology Season 1
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol.
Experience the outbreak of the Pangu Virus from multiple perspectives across as the brave heroes of the Center for Epidemic Research and Control battle tirelessly to stop the spread of a cataclysmic alien virus that has mutated innocent people into monstrous creatures of unimaginable power