Single-player games like Astro Protocol
Below are 8 single-player Steam games similar to Astro Protocol, 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 Astro Protocol page.
Ranked picks
- 1
DeckTerra
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
A Medieval 4X Deckbuilder. Lead a kingdom as you build your deck to conquer the map and expand your rule. Develop your technology through the middle ages to improve your army of knights and keep your peasants happy. Develop your trade, religion, science, and military to conquer the continent.
- 2
Sid Meier's Civilization®: Beyond Earth™
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
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.
- 3
Galactic Civilizations III
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
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.
- 4
Warhammer 40,000: Gladius - Relics of War
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
Warhammer 40,000: Gladius – Relics of War brings you to a world of terror and violence. Four factions will engage in a brutal war for dominance over the planet’s resources. In the first turn-based 4X strategy game set in Warhammer 40,000 you will lead one of four unique factions.
- 5
Fantasy General II
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
The fantasy wargaming classic is back! Lead powerful heroes and mighty armies into battle in this critically acclaimed turn-based strategy milestone. Level up and train your units and guide them through a gripping story campaign to decide the fate of a world on the brink of destruction.
- 6
ENDLESS™ Legend
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
ENDLESS™ Legend is a 4X turn-based fantasy strategy game by the creators of ENDLESS™ Space and Dungeon of the ENDLESS™. Control every aspect of your civilization as you struggle to save your homeworld Auriga. Create your own Legend!
- 7
Shadow Empire
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
Shadow Empire is a deep turn-based 4X wargame with a unique blend of military focus, procedurally generated content and role-playing features. Players take the seat of the supreme ruler of a small nation, with the goal of reconquering a devastated planet.
- 8
Sid Meier's Civilization® V
Single-player alternative to Astro Protocol — playable solo, no multiplayer required. Shares Strategy with Astro Protocol.
Create, discover, and download new player-created maps, scenarios, interfaces, and more!