Single-player games like Unknown Horizons
Below are 8 single-player Steam games similar to Unknown Horizons, 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 Unknown Horizons page.
Ranked picks
- 1
Stardust Origins
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Adventure and Simulation with Unknown Horizons.
You are a pilot, seeking revenge on your deceitful father who threw you into unknown space. Can you find your way back and get revenge? Experience a mix of 2D topdown space adventure and explore planets to discover quests, negotiate trades, mine, hunt and survive in an expanding universe.
- 2
Naev
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Adventure and Simulation with Unknown Horizons.
Naev is a game about space exploration, trade and combat. Players travel the galaxy and earn money by trading, fighting and performing missions.
- 3
Rebel Galaxy
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Adventure and Simulation with Unknown Horizons.
Rebel Galaxy is a swashbuckling space adventure, with action-packed combat, exploration, discovery, trade, and “negotiation” with the outlandish denizens at the edge of the known universe.
- 4
Ostranauts
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Simulation and RPG with Unknown Horizons.
Navigate your scrappy ship through the boneyard in search of valuable parts in abandoned vessels. Use salvage to upgrade your ship, or sell it for cash to pay down your mounting debt, or restock fuel, air, or food. Fly and role-play aboard your dream spaceship in this hardcore noir space-sim.
- 5
Gaia Beyond
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Adventure and Simulation with Unknown Horizons.
Gaia Beyond is a handcrafted 2D Action-RPG, an exploration mix built around the core features fighting, mining and trading. Your decisions are footprints within a vast non-linear solar system. Forge alliances among numerous factions and develop relations with hundreds of NPCs.
- 6
Void Sols
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Adventure and RPG with Unknown Horizons.
Abstract ruins. Hostile shapes. No escape but forward... Death isn’t the end as you know it. Here, it’s how you grow! Each defeat teaches you more as you rise again to defeat foes with stolen blades and bows. Pushing through a broken world warped by cruelty and shadows. Welcome. This is Void Sols.
- 7
PULSAR: Lost Colony
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Adventure and Simulation with Unknown Horizons.
The co-op open-world space sim where everyone has a role! Pilot the ship. Reroute power. Launch nukes. Explore alien planets. Research new talents. Work together to find the Lost Colony! ...or just deliver some biscuits
- 8
Starpoint Gemini 2
Single-player alternative to Unknown Horizons — playable solo, no multiplayer required. Shares Simulation and RPG with Unknown Horizons.
Captain your own space ship and roam the galaxy in 3D in this tactical space simulator with tons of RPG depth ! Space has never looked so inviting - but images can betray...It has been two years since the end of the second Gemini war, the situation in the wartorn system is further from resolution than ever.