Single-player games like Subnautica 2
Below are 10 single-player Steam games similar to Subnautica 2, 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 2 page.
Ranked picks
- 1
Subnautica
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Adventure with Subnautica 2.
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.
- 2
Subnautica: Below Zero
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Adventure with Subnautica 2.
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 2 — playable solo, no multiplayer required. Shares Action and Adventure with Subnautica 2.
No Man's Sky is a game about exploration and survival in an infinite procedurally generated universe.
- 4
Grounded
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Action and Adventure with Subnautica 2.
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?
- 5
Valheim
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Action and Adventure with Subnautica 2.
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
Raft
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Adventure with Subnautica 2.
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!
- 7
Satisfactory
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Adventure with Subnautica 2.
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!
- 8
Barotrauma
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Action with Subnautica 2.
Barotrauma is a 2D co-op submarine simulator – in space, with survival horror and RPG elements. Steer your submarine, complete missions, fight monsters, fix leaks, operate machinery, man the guns and craft items, and stay alert: danger in Barotrauma doesn’t announce itself!
- 9
Moonbreaker
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required. Shares Action with Subnautica 2.
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.
- 10
Zen of Sudoku
Single-player alternative to Subnautica 2 — playable solo, no multiplayer required.
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.