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
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.
- 2
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.
- 3
Cataclysm Era
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Strategy with Cepheus Protocol.
Build your forces, conquer cities, and unite the wasteland. Ashes&Gunfire merges real-time tactics, fast-paced top-down battles, and deep management systems to let you forge a new order from the world’s remains.
- 4
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.
- 5
VEIN
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Simulation with Cepheus Protocol.
VEIN is a post-apocalyptic survival multiplayer sandbox game. Gather supplies to survive, explore abandoned buildings, defend your home, and rebuild society, whether alone or with friends.
- 6
Dying Breed
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Action and Strategy with Cepheus Protocol.
Golden-age RTS classic. Fast-paced action & strategic decision-making, battling evil arch-enemies, zombies, and retro-futuristic technologies. All to a '90s electro-metal soundtrack and FMV live-action cut scenes.
- 7
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!
- 8
Plague Inc: Evolved
Single-player alternative to Cepheus Protocol — playable solo, no multiplayer required. Shares Strategy and Indie with Cepheus Protocol.
Plague Inc: Evolved is a unique mix of high strategy and terrifyingly realistic simulation. Your pathogen has just infected 'Patient Zero' - now you must bring about the end of human history by evolving a deadly, global Plague whilst adapting against everything humanity can do to defend itself.
- 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