Single-player games like Horizon
Below are 15 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
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.
- 2
NationWar2:Chronicle
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Indie with Horizon.
NationWar 2.0 is a big strategy game based on the theme of the Spring and Autumn and Warring States period. There are more than 60 countries to choose from in the game. Map 1: 1 restores the mountainous landscapes and rivers of China.
- 3
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!
- 4
Sid Meier's Civilization®: Beyond Earth™
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
Sid Meier’s Civilization: Beyond Earth is a new science-fiction-themed entry into the award winning Civilization series. As part of an expedition sent to find a home beyond Earth, lead your people into a new frontier, explore and colonize an alien planet and create a new civilization in space.
- 5
ZEPHON
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
From the developers of Warhammer 40,000: Gladius, ZEPHON is a post-apocalyptic 4X strategy game built on Proxy’s unique tactical combat system. Guide survivors through a turbulent future, navigating unexpected disasters, eldritch horror and cyberpunk monstrosities. What will you do to survive?
- 6
Xenonauts 2
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Simulation with Horizon.
Wage a global war of resistance against an alien invasion. Command turn-based tactical battles, build a network of covert bases, directly control your fighter wings, and achieve strategic victory in a simulation of asymmetric warfare against a technologically superior foe.
- 7
Space Empires I
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy with Horizon.
Space Empires I is the first chapter of the Space Empires series. A classic galactic conquest and turn-based strategy video game where you are the leader of a race of intelligent beings building large spaceships for interplanetary and interstellar travel through warp points between star systems.
- 8
Breachway
Single-player alternative to Horizon — playable solo, no multiplayer required. Shares Strategy and Simulation with Horizon.
Explore the galaxy in this deckbuilding, sci-fi roguelike where ship upgrades and crew management are key to your survival. Optimize resource generation, engage in intense turn-based battles, and take on ever-growing threats as you seek out The Signal.
- 9
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.
- 10
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.
- 11
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.
- 12
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?
- 13
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.
- 14
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.
- 15
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.