Single-player games like Subnautica
Below are 18 single-player Steam games similar to Subnautica, 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 Subnautica page.
Ranked picks
- 1
Subnautica 2
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Adventure with Subnautica.
Subnautica 2 is an underwater survival adventure set on an all-new alien world, developed by Unknown Worlds. Play alone or with friends in 4-player co-op. Adapt to survive by building custom bases and crafting tools. Explore the unknown to uncover the mysteries hidden within the depths.
- 2
Subnautica: Below Zero
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Dive into a freezing underwater adventure on an alien planet. Below Zero is set two years after the original Subnautica. Return to Planet 4546B to uncover the truth behind a deadly cover-up. Survive by building habitats, crafting tools, & diving deeper into the world of Subnautica.
- 3
No Man's Sky
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Adventure with Subnautica.
No Man's Sky is a game about exploration and survival in an infinite procedurally generated universe.
- 4
Raft
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Raft™ throws you and your friends into an epic oceanic adventure! Alone or together, players battle to survive a perilous voyage across a vast sea! Gather debris, scavenge reefs and build your own floating home, but be wary of the man-eating sharks!
- 5
Valheim
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
A collaborative exploration and survival game for 1-10 players, set in a procedurally generated afterlife inspired by Viking culture. Battle, build, and conquer your way to a saga worthy of Odin’s patronage!
- 6
Satisfactory
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Satisfactory is a first-person open-world factory building game with a dash of exploration and combat. Play alone or with friends, explore an alien planet, create multi-story factories, and enter conveyor belt heaven!
- 7
The Forest
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
As the lone survivor of a passenger jet crash, you find yourself in a mysterious forest battling to stay alive against a society of cannibalistic mutants. Build, explore, survive in this terrifying first person survival horror simulator.
- 8
The Planet Crafter
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Adventure with Subnautica.
A space survival open world terraforming crafting game, designed for 1 to 10 players. Alter the ecosystem of an inhospitable planet to render it habitable for humanity. Survive, gather resources, and build your base. Then, generate oxygen, warmth, and pressure to create a brand new biosphere.
- 9
Outer Wilds
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Adventure with Subnautica.
Named Game of the Year 2019 by Giant Bomb, Polygon, Eurogamer, and The Guardian, Outer Wilds is a critically-acclaimed and award-winning open world mystery about a solar system trapped in an endless time loop.
- 10
Grounded
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Adventure with Subnautica.
The world is a vast, beautiful and dangerous place – especially when you have been shrunk to the size of an ant. Can you thrive alongside the hordes of giant insects, fighting to survive the perils of the backyard?
- 11
Pacific Drive
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Face the supernatural dangers of the Olympic Exclusion Zone with a car as your only lifeline in this driving survival adventure! Scavenge resources, load up your trusty station wagon, and drive like hell to make it through alive.
- 12
The Long Dark
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
THE LONG DARK is a thoughtful, exploration-survival experience that challenges solo players to think for themselves as they explore an expansive frozen wilderness in the aftermath of a geomagnetic disaster. There are no zombies -- only you, the cold, and all the threats Mother Nature can muster.
- 13
Don't Starve
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Don’t Starve is an uncompromising wilderness survival game full of science and magic. Enter a strange and unexplored world full of strange creatures, dangers, and surprises. Gather resources to craft items and structures that match your survival style.
- 14
Forever Skies
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
A first-person survival game set on a post-apocalyptic, ecologically ruined Earth. Play solo or with up to 3 friends as you build, upgrade, and fly a high-tech airship. Scavenge resources, craft tools, and face dangers on the surface as you hunt for a cure to save humanity.
- 15
Sons Of The Forest
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Sent to find a missing billionaire on a remote island, you find yourself in a cannibal-infested hellscape. Craft, build, and struggle to survive, alone or with friends, in this terrifying new open-world survival horror simulator.
- 16
Firewatch
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie and Adventure with Subnautica.
Firewatch is a single-player first-person mystery set in the Wyoming wilderness, where your only emotional lifeline is the person on the other end of a handheld radio.
- 17
Moonbreaker
Single-player alternative to Subnautica — playable solo, no multiplayer required.
Moonbreaker is a turn-based strategy, tactical skirmish game. The game is designed to be a true digital miniatures experience, set in an expansive sci-fi universe crafted by Brandon Sanderson. Direct Captain and Crew in gripping, ever-changing competition and adventure.
- 18
Zen of Sudoku
Single-player alternative to Subnautica — playable solo, no multiplayer required. Shares Indie with Subnautica.
From the creators of Natural Selection comes Zen of Sudoku, a relaxing, easy to play version of Sudoku for your PC.Relax with hand-painted Japanese-styled backgrounds, no timer and lush natural soundscapes.Stimulates your brain to keep it healthy and alert.