Single-player games like Under A New Sun
Below are 8 single-player Steam games similar to Under A New Sun, 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 Under A New Sun page.
Ranked picks
- 1
KeepUp Survival
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Indie and Adventure with Under A New Sun.
KeepUp Survival is an open base-building and exploration game set in a natural, abandoned world. Build, gather, survive, and unfold your own story on a mysterious island.
- 2
Sunkenland
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Indie and Early Access with Under A New Sun.
Get ready for a Waterworld-themed survival game with modular base building, sunken city scavenging, crafting, base defense, and invasions of NPC clans for resources and territory. Ready for the water apocalypse?
- 3
Project Castaway
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Adventure with Under A New Sun.
Project Castaway is a survival crafting title set in the Pacific Ocean. Live the life of a stranded castaway, with only yourself - and the island's inhabitants - for company! Sail the ocean, hunt, explore unique islands and gather resources as you fight for survival.
- 4
Survival: Fountain of Youth
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Indie and Adventure with Under A New Sun.
Survival: Fountain of Youth is a challenging single-player open-world adventure game set on the Caribbean islands. Survive as a shipwrecked 16th-century explorer, craft tools and shelter, and uncover the secrets of both an ancient civilization and your own fate.
- 5
Life Not Supported
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Adventure and Simulation with Under A New Sun.
You are the lone survivor orbiting a potential new home planet, tethered to what’s left of your ship. Gather nearby debris and assemble a make-shift vessel in an attempt to survive the harsh realities of space. Maybe you'll live long enough to uncover the truth behind the ship's malfunction...
- 6
Stranded Deep
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Indie and Adventure with Under A New Sun.
Take the role of a plane crash survivor stranded somewhere in the Pacific Ocean. Come face to face with some of the most life threatening scenarios that will result in a different experience each time you play. Scavenge. Discover. Survive.
- 7
Subnautica
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Indie and Adventure with Under A New Sun.
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.
- 8
Eden Crafters
Single-player alternative to Under A New Sun — playable solo, no multiplayer required. Shares Indie and Adventure with Under A New Sun.
Eden Crafters is a solo or co-op open-world survival, crafting, and factory-building game where you transform a hostile planet into a habitable haven for humanity. Build, automate, and terraform. Control the climate, create a breathable atmosphere, and turn toxic lakes into water: shape a new world!