Single-player games like Horizon
Below are 14 single-player Steam games similar to Horizon, 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 Horizon page.
Ranked picks
- 1
Interstellar Space: Genesis
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
Interstellar Space: Genesis is a turn-based space 4X strategy game in which you attempt to build a thriving galactic empire. Discover mysteries among the stars, colonize worlds, and engage enemies in tactical turn-based combat on your journey to becoming the ruler of the galaxy!
- 2
The Last Federation
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
From the creators of AI War: Fleet Command comes an all-new grand strategy title with turn-based tactical combat, set in a deep simulation of an entire solar system and its billions of inhabitants. You are the last of a murdered race, determined to unify or destroy the 8 others.
- 3
Master of Orion
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
The ascendant spacefaring 4X strategy game returns! A new chapter in the epic Master of Orion saga is poised to once again capture the imaginations of millions of gamers.
- 4
ENDLESS™ Space - Definitive Edition
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
ENDLESS™ Space is a turn-based 4X strategy game, covering the space colonization age in the ENDLESS™ Universe, where you can control every aspect of your civilization as you strive for galactic domination.
- 5
Stars in Shadow
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
Stars in Shadow is a turn-based 4X strategy game and a vivid tribute to the genre classics. Compete with alien factions to explore and colonize nearby starsystems, build fleets to defend against rivals, negotiate or conquer them. Win by unifying the galaxy, through diplomacy or force.
- 6
Galactic Civilizations III
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
Build a civilization that will stand the test of time in the largest space-based strategy game ever! Choose from dozens of unique races and make a name for yourself across the galaxy through diplomacy, espionage, technological advances, and more.
- 7
Stellaris
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Simulation with Horizon.
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.
- 8
Xenonauts
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
Xenonauts is a strategy game in which you control a multi-national military organisation defending a Cold War-era Earth from alien invasion, using small squads of persistent soldiers to eliminate the extraterrestrials and recover their technology in turn-based ground combat.
- 9
Star Ruler 2
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
Massive scale 4X-RTS set in space. Control hundreds of planets, manipulate galactic politics, research numerous advanced technologies, and command thousands of units and hundreds of planets in your quest for galactic dominance.
- 10
ENDLESS™ Space 2
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
ENDLESS™ Space 2 is a Strategic Space Opera, featuring the compelling “just one more turn” gameplay, set in the mysterious ENDLESS™ Universe. As the leader of your civilization, will you impose your vision and build the greatest stellar empire?
- 11
Master of Orion 2
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
Forge an empire in a universe where population growth is stripping away planetary resources. Colonize unknown planets and trade with other races for their knowledge.
- 12
Command & Conquer: Red Alert 3 - Uprising
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Free To Play with Horizon.
Red Alert 3: Uprising features four new mini-campaigns, giving players a deeper dive into the storyline's of the Soviets, the Allies, the Empire of the Rising Sun and a unique campaign centered on the origins of everyone’s favorite psionic Japanese schoolgirl commando, Yuriko Omega.
- 13
Sins of a Solar Empire II
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Simulation with Horizon.
Battle for galactic dominance in this real-time 4X strategy game with unrivaled scale! You’ll explore, expand, exploit, and exterminate through military force, diplomacy, trade, culture, influence, and other underhanded tactics.
- 14
Sword of the Stars: The Pit
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
A fun, fast, light-hearted, turn-based RPG, where the tradition of old school dungeon-diving games meets the sci-fi Sword of the Stars universe!