Single-player games like Cepheus Protocol: Project Fenrir
Below are 10 single-player Steam games similar to Cepheus Protocol: Project Fenrir, 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: Project Fenrir page.
Ranked picks
- 1
DECAYED
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol: Project Fenrir.
Taking the place of a Green Beret, you will single-handedly witness the world fall, following the events of a failed search and rescue mission. Barely making it out with your life, you will witness pure chaos unfold, as you soon find yourself within an undead hellscape.
- 2
BunkerZ
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol: Project Fenrir.
Claymation-inspired WWI trenches meet explosive co-op mayhem. Hold the bunker as a Rifleman, Medic, Engineer, or Machine Gunner. Fight back with WWI-inspired weapons, shovels, and flamethrowers, then launch undead sky-high with explosives. Survive solo or squad up with friends.
- 3
Rotfront
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol: Project Fenrir.
Rotfront is a singleplayer FPS set out in the state of Washington in the year 2034. Infiltrate as a lone Operator, purge infected areas, kill as many Rots as possible and unlock weapons as you level up and grow stronger.
- 4
Survive the Horde
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol: Project Fenrir.
Face overwhelming hordes of the undead in a hyper-realistic post-apocalyptic world. Build defenses, wield devastating weapons, and unleash powerful abilities as you tear through swarms of zombies in this adrenaline-fueled first-person survival shooter.
- 5
WAR OPERATION™ : Full Contact
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Early Access with Cepheus Protocol: Project Fenrir.
Iraq, April 2003, in the midst of a frighteningly intense confrontation. Iraqi army against the U.S. Marines, take your class, your weapons and run through Baghdad streets, near Firdos Square, frozen in the days of Saddam Hussein's regime. A unique and exceptional experience never seen before.
- 6
DEADFALL
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action with Cepheus Protocol: Project Fenrir.
Fight alone or with friends in a brutal horror wave-survival experience. Survive against endless waves of terrifying infected in this high-difficulty horror shooter. Play solo or with friends, unlock devastating weapons, discover secrets, and see how long you can endure the nightmare.
- 7
Zombie Army Trilogy
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action with Cepheus Protocol: Project Fenrir.
The cult horror shooter series comes to an apocalyptic conclusion with an epic new third chapter, a heart-pumping new horde mode, and remastered editions of the best-selling Nazi Zombie Army 1 & 2.
- 8
Aliens: Fireteam Elite 2
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action with Cepheus Protocol: Project Fenrir.
This is a fight for survival. Xenomorphs swarm in overwhelming numbers. Every room could be your last.
- 9
Cepheus Protocol
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol: Project Fenrir.
Cepheus Protocol is an Open World RTS Military Survival Game. Play as the CERC hunting Patient 0, maintain Quarantine camps, fight dangerous mutations & Rogue Civilian Combatants . There’s nobody else coming, it’s up to you now.
- 10
Cepheus Protocol Anthology Season 1
Single-player alternative to Cepheus Protocol: Project Fenrir — playable solo, no multiplayer required. Shares Action and Indie with Cepheus Protocol: Project Fenrir.
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