Single-player games like The Alters
Below are 23 single-player Steam games similar to The Alters, 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 Alters page.
Ranked picks
- 1
Project Tomorrow
Single-player alternative to The Alters — playable solo, no multiplayer required.
A base-building survival game with terraforming and crafting. Earth lies poisoned and abandoned ten thousand years after invasion. Awaken from stasis, defend your fragile foothold, and restore a dead world so humanity can live here again.
- 2
Airlock
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
Plan in the ant farm. Live in the 3D city. AIRLOCK is a post-apocalyptic survival base-builder where you rescue Settlers from ruined Ashgate, build a sanctuary deep beneath the toxic surface, and outlast The Altered. The Last of Us meets The Alters.
- 3
Wreckborn
Single-player alternative to The Alters — playable solo, no multiplayer required.
Cleanse the system of pirates, destroy their bases and free the captives. On the asteroids, build a base, mining colonies, explore asteroids and extract resources needed for survival. Develop buildings, build defenses and turn the asteroid into a fortress.
- 4
Red Dust Colony
Single-player alternative to The Alters — playable solo, no multiplayer required.
The spirit of the space race lives on in this Mars based colony sim. Mine, craft and research in order to build up your initial lander into a self sustaining colony. Keep oxygen levels high and CO₂ levels low. Discover and grow a variety of plants to balance out colonist nutrition.
- 5
Heng Rover Mission
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
Build, launch, and survive. Design your own rover and automated robot workforce to conquer the harsh Martian climate, fulfill Mission Control directives, and uncover the secrets of the red planet in Heng Mar Mission.
- 6
AETHUS
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
Explore a vast underground world to mine and craft hundreds of items while building up your modular Outpost on the surface, to prospect for gems, refine resources and farm hydroponic crops in this top-down sci-fi survival-crafter where the story always provides a reason to dig deeper.
- 7
Nightwater
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
Forage, craft and automate to grow your factory, unlock new technologies and expand your island to discover new biomes. Progress through the ages from sticks and stones to the Bronze Age, the Industrial Era and into the future to uncover the secret of the Lighthouse and escape this reality.
- 8
Blossom: The Seed of Life
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
Terraform a dead planet back to life in this open world survival crafting game. Explore ruins, gather resources, print machines, drive modular vehicles, grow forests, biomes, and ecosystems. Create life and make it thrive with your own hands.
- 9
Fallout Shelter
Single-player alternative to The Alters — playable solo, no multiplayer required.
Fallout Shelter puts you in control of a state-of-the-art underground Vault from Vault-Tec. Build the perfect Vault, keep your Dwellers happy, and protect them from the dangers of the Wasteland.
- 10
This War of Mine
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
In This War Of Mine you do not play as an elite soldier, rather a group of civilians trying to survive in a besieged city; struggling with lack of food, medicine and constant danger from snipers and hostile scavengers. The game provides an experience of war seen from an entirely new angle.
- 11
The Bureau: XCOM Declassified
Single-player alternative to The Alters — playable solo, no multiplayer required.
The year is 1962 and the Cold War has the nation gripped by fear. A top-secret government unit called The Bureau begins investigating a series of mysterious attacks by an enemy more powerful than communism.
- 12
The Stanley Parable
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
The Stanley Parable is a first person exploration game. You will play as Stanley, and you will not play as Stanley. You will follow a story, you will not follow a story. You will have a choice, you will have no choice. The game will end, the game will never end.
- 13
The Talos Principle
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
The Talos Principle is a first-person puzzle game in the tradition of philosophical science fiction. Made by Croteam and written by Tom Jubert (FTL, The Swapper) and Jonas Kyratzes (The Sea Will Claim Everything).
- 14
Subnautica
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
Descend into the depths of an alien underwater world filled with wonder and peril. Craft equipment, pilot submarines and out-smart wildlife to explore lush coral reefs, volcanoes, cave systems, and more - all while trying to survive.
- 15
Stellaris
Single-player alternative to The Alters — playable solo, no multiplayer required.
Explore a galaxy full of wonders in this sci-fi grand strategy game from Paradox Development Studios. Interact with diverse alien races, discover strange new worlds with unexpected events and expand the reach of your empire. Each new adventure holds almost limitless possibilities.
- 16
SOMA
Single-player alternative to The Alters — playable solo, no multiplayer required. Shares Adventure with The Alters.
From the creators of Amnesia: The Dark Descent comes SOMA, a sci-fi horror game set below the waves of the Atlantic ocean. Struggle to survive a hostile world that will make you question your very existence.
- 17
Frostpunk
Single-player alternative to The Alters — playable solo, no multiplayer required.
Frostpunk is the first society survival game. As the ruler of the last city on Earth, it is your duty to manage both its citizens and infrastructure. What decisions will you make to ensure your society's survival? What will you do when pushed to breaking point? Who will you become in the process?
- 18
Frostpunk 2
Single-player alternative to The Alters — playable solo, no multiplayer required.
Develop, expand, and advance your city in a society survival game set 30 years after an apocalyptic blizzard ravaged Earth. In Frostpunk 2, you face not only the perils of never-ending winter, but also the powerful factions that watch your every step inside the Council Hall.
- 19
Anomaly: Warzone Earth
Single-player alternative to The Alters — playable solo, no multiplayer required.
Lead an armored squad through the perils of this reversed tower defense action-strategy game!
- 20
Anomaly 2
Single-player alternative to The Alters — playable solo, no multiplayer required.
Anomaly 2 is a sequel to the critically acclaimed Anomaly Warzone Earth. Maintaining the core elements of the original, Anomaly 2 adds plenty of new features: unit morphing, over million tactical combinations, post-apo world and tower defense vs tower offense multiplayer mode.
- 21
Anomaly Defenders
Single-player alternative to The Alters — playable solo, no multiplayer required.
Anomaly Defenders is the closing installment of the Anomaly series. The original incarnation of the Tower Offense sub-genre had players controlling humans fighting alien invaders. Now, the tables have turned. The human counterattack is underway and the alien homeworld is under threat.
- 22
Anomaly Korea
Single-player alternative to The Alters — playable solo, no multiplayer required.
Exclusively brought to Steam for PC, Mac and Linux in Anomaly Bundle, Anomaly Korea is an expansion campaign to Anomaly Warzone Earth. The alien robots are back and this time they’ve got Korea in their sights. It’s your job to lead a squad into fierce fire-fights and fend off the alien invasion.
- 23
Anomaly Warzone Earth Mobile Campaign
Single-player alternative to The Alters — playable solo, no multiplayer required.
Anomaly Warzone Earth Mobile Campaign continues Steam's Anomaly Warzone Earth in an extra 15-level campaign. Originally released on mobile devices, the campaign is brought to Steam for PC, Mac and Linux exclusively in Anomaly Bundle. AWE Mobile Campaign turns tower defense on its head.