Single-player games like Fort Solis
Below are 14 single-player Steam games similar to Fort Solis, 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 Fort Solis page.
Ranked picks
- 1
The Invincible
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Rethink human’s dominion in The Invincible: a story-driven adventure set in a hard sci-fi world by Stanisław Lem. Discover planet Regis III as scientist Yasna, use atompunk tools looking for a missing crew and face unforeseen threats. Make choices in a philosophical story that’s driven by science.
- 2
1000xRESIST
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
1000xRESIST is a thrilling sci-fi adventure. The year is unknown, and a disease spread by an alien invasion keeps you underground. You are Watcher. You dutifully fulfil your purpose in serving the ALLMOTHER, until the day you discover a shocking secret that changes everything.
- 3
The Operator
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Welcome to the FDI. As our newest Operator, your role is to use your detective skills to assist our field agents and investigate mysterious crimes. Use cutting-edge FDI software to dig for clues, solve puzzles, and uncover the truth.
- 4
Martha Is Dead
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Set in 1944 Italy, Martha Is Dead is an award-winning dark psychological thriller where the lines between truth, superstition, and tragedy blur. Explore a haunting countryside, uncover disturbing memories, and peel back layers of mystery. Every choice shapes the nightmare…are you ready to face it?
- 5
Fears to Fathom - Ironbark Lookout
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Jack Nelson, a 24-year-old fire lookout, transferred to a new outpost. As he settled into his new home, he couldn't shake the feeling that something was off, little did he know what was transpiring down in Ironbark State Park.
- 6
Tacoma
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Tacoma is a sci-fi narrative adventure from the creators of Gone Home. Set aboard a high-tech space station in the year 2088, explore every detail of how the station’s crew lived and worked, finding the clues that add up to a gripping story of trust, fear, and resolve in the face of disaster.
- 7
Moons of Madness
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Moons of Madness is a first-person, story-driven cosmic horror game where the scientific exploration of Mars meets the supernatural dread of Lovecraft.
- 8
Deliver Us Mars
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Deliver Us Mars is an atmospheric sci-fi adventure taking you on a suspense-fuelled, high-stakes mission to recover the ARK colony ships stolen by the mysterious Outward.
- 9
What Remains of Edith Finch
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
What Remains of Edith Finch is a collection of strange tales about a family in Washington state. As Edith, you’ll explore the colossal Finch house, searching for stories as she explores her family history and tries to figure out why she's the last one in her family left alive.
- 10
System Shock 2: 25th Anniversary Remaster
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
System Shock® 2: 25th Anniversary Remaster is a genre defining experience that established innovative game-play mechanics that are a staple of the FPS and RPG genre today. Survive the wretched corridors of the Von Braun. Your training has prepared you for this.
- 11
The Martian Job
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Rob the first Martian casino and find out who really rules the planet! Crack a safe, break some hearts, start a revolution, or get rich beyond the stars!
- 12
Red Dead Redemption 2
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Arthur Morgan and the Van der Linde Gang are outlaws on the run. With federal agents and bounty hunters massing on their heels, the gang must rob, steal, and fight their way across the rugged heartland in order to survive.
- 13
Ultra Mega Cats
Single-player alternative to Fort Solis — playable solo, no multiplayer required.
Blast your way through hordes of enemies in Ultra Mega Cats, a cooperative roguelike third-person shooter. Play As one of the Mega Cats, armed to the fangs with a wide variety of abilities and escape captivity from your Rodent and Bird Overlords!
- 14
Insanitorium - Don’t Be Afraid
Single-player alternative to Fort Solis — playable solo, no multiplayer required. Shares Adventure with Fort Solis.
Trapped in a psychiatric hospital, you must escape demons lurking in the shadows.Explore Insanitorium only with your flashlight and scarce batteries, defend yourself with a machete and a dart gun, and face the strange patients. Remember, do not listen to the mannequins that whisper inside your head.