Single-player games like The Callisto Protocol™
Below are 16 single-player Steam games similar to The Callisto 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 The Callisto Protocol™ page.
Ranked picks
- 1
Dead Space
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
The sci-fi survival-horror classic returns, completely rebuilt to offer an even more immersive experience — including visual, audio, and gameplay improvements — while staying faithful to the original game’s thrilling vision.
- 2
Resident Evil Requiem
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
Requiem for the dead. Nightmare for the living. Prepare to escape death in a heart-stopping experience that will chill you to your core.
- 3
The Evil Within 2
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
Detective Sebastian Castellanos has lost everything, including his daughter, Lily. To save her, he must descend into the nightmarish world of STEM. Horrifying threats emerge from every corner, and he must rely on his wits to survive. For his one chance at redemption, the only way out is in.
- 4
Warhammer 40,000: Space Marine 2
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
Embody the superhuman skill and brutality of a Space Marine. Unleash deadly abilities and devastating weaponry to obliterate the relentless Tyranid swarms. Defend the Imperium in spectacular third-person action in solo or multiplayer modes.
- 5
Aliens: Fireteam Elite
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action with The Callisto Protocol™.
Aliens: Fireteam Elite is a cooperative third-person survival game set in the iconic Alien Universe. Battle through hordes of different types of Xenomorph, customize your character and gear, and level-up as you try to contain this ever-growing threat.
- 6
Alien: Isolation
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action with The Callisto Protocol™.
Discover the true meaning of fear in Alien: Isolation, a survival horror set in an atmosphere of constant dread and mortal danger.
- 7
Tormented Souls 2
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
Caroline Walker returns in the sequel to the award-winning survival horror classic. Explore the decaying remains of the secluded Villa Hess, use improvised weapons to confront terrifying creatures, and bend the fabric of reality to save your sister from a twisted cult.
- 8
ROUTINE
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
ROUTINE is a First Person Sci-Fi Horror set on an abandoned lunar base designed around an 80s vision of the future. Explore and investigate your surroundings as you survive against unknown threats.
- 9
Resident Evil
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
The game that defined the survival-horror genre is back! Check out the remastered HD version of Resident Evil.
- 10
The Evil Within
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action with The Callisto Protocol™.
Developed by Shinji Mikami -- creator of the seminal Resident Evil series -- and the talented team at Tango Gameworks, The Evil Within embodies the meaning of pure survival horror. Highly-crafted environments, horrifying anxiety, and an intricate story are combined to create an immersive world that will bring you to the height of tension.
- 11
The Life and Suffering of Sir Brante
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Adventure with The Callisto Protocol™.
A narrative-driven hardcore RPG set in a gritty world ruled by real but unrelenting gods. Set out on a challenging lifetime journey, where every choice has a price and entails consequences. Will you become an inquisitor, a judge, or conspire against the old order? Dare to decide!
- 12
Resident Evil 4
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
Survival is just the beginning. Six years have passed since the biological disaster in Raccoon City. Leon S. Kennedy, one of the survivors, tracks the president's kidnapped daughter to a secluded European village, where there is something terribly wrong with the locals.
- 13
SILENT HILL 2
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
Investigating a letter from his late wife, James returns to where they made so many memories - Silent Hill. What he finds is a ghost town, prowled by disturbing monsters and cloaked in deep fog. Confront the monsters, solve puzzles, and search for traces of your wife in this remake of SILENT HILL 2.
- 14
Quake 4
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action with The Callisto Protocol™.
As part of the elite Rhino Squad, you must spearhead Earth’s military invasion of a hostile alien homeworld. But, in this desperate war for humanity’s survival against an unrelenting enemy, you may discover that the only way to defeat them...is to become one of them.
- 15
The Last of them
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action and Adventure with The Callisto Protocol™.
You play as a detective solving gruesome murders in a haunting, desolate city. Explore dark alleys, uncover hidden clues, and solve puzzles to unravel the mystery. Can you find the killer before they strike again, or will you fall victim to the terror?
- 16
![[REDACTED] — Steam game cover](https://shared.akamai.steamstatic.com/store_item_assets/steam/apps/2229940/header.jpg?t=1746457046)
[REDACTED]
Single-player alternative to The Callisto Protocol™ — playable solo, no multiplayer required. Shares Action with The Callisto Protocol™.
Get ready to massacre monsters, race your rivals, and combat corpses of your fellow guards as you race to escape Black Iron Prison in the critically acclaimed roguelike, [REDACTED].