Single-player games like Reassembly
Below are 12 single-player Steam games similar to Reassembly, 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 Reassembly page.
Ranked picks
- 1
Space Pirates And Zombies 2
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Strategy with Reassembly.
Design and then improve the ultimate mothership. Explore a persistent living galaxy populated by 200 unique captains that can do everything you can do. Survive the zombie infection and then fight them back. Make allies and start your own faction. Build your empire. Also includes Sandbox Mode.
- 2
StarMade
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Strategy with Reassembly.
The ultimate space sandbox. Participate in epic fleet battles, form alliances, strive to dominate entire galaxies and harness the universe’s resources for your industrious empire or the destruction of others. Customise your experience, the universe is yours!
- 3
Space Pirates and Zombies
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Strategy with Reassembly.
Explore a randomly generated Galaxy populated with factions, enemies, missions, and items providing you with a unique experience each time you play.
- 4
Celestial Command
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Strategy with Reassembly.
Mine asteroids, salvage space debris, design your own small or massive spacecraft using individual functional components, complete missions, and engage in battles against enemies in a vast galaxy with realistic physics based on orbital mechanics or in a classic physics mode.
- 5
Space Engineers
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Strategy with Reassembly.
Space Engineers is a sandbox engineering game where you design and build ships, stations, and planetary bases in a fully destructible environment. Explore planets and space, mine resources, survive hazards, and engage in combat alone or with friends in Creative or Survival modes.
- 6
Kerbal Space Program
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Indie with Reassembly.
In Kerbal Space Program, take charge of the space program for the alien race known as the Kerbals. You have access to an array of parts to assemble fully-functional spacecraft that flies (or doesn’t) based on realistic aerodynamic and orbital physics.
- 7
X3: Terran Conflict
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Strategy with Reassembly.
It is the year 2938. The long wished-for encounter of the X Universe and the Earth holds both joy and sorrow for the people. Despite flourishing trade, the clash of the diverse races, cultures and life forms creates new tensions, mistrust and open conflict that need to be overcome!
- 8
Avorion
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Indie with Reassembly.
A procedural co-op space sandbox where players can build their own space ships out of dynamically scalable blocks. Fight epic space battles, explore, mine, trade, wage wars and build your own empire to save your galaxy from being torn apart by an unknown enemy.
- 9
Terraria
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Indie with Reassembly.
Dig, fight, explore, build! Nothing is impossible in this action-packed adventure game. Four Pack also available!
- 10
Valheim
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Indie with Reassembly.
A brutal exploration and survival game for 1-10 players, set in a procedurally-generated purgatory inspired by viking culture. Battle, build, and conquer your way to a saga worthy of Odin’s patronage!
- 11
No Man's Sky
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action with Reassembly.
No Man's Sky is a game about exploration and survival in an infinite procedurally generated universe.
- 12
Croak Crusader: Spawn of the Spore Spectre
Single-player alternative to Reassembly — playable solo, no multiplayer required. Shares Action and Indie with Reassembly.
Embark on an odyssey into the unknown! Behold the tale of Toadman, an enigmatic being born from alien tech and the mysteries of Radiant Verde. Witness his perilous quest through treacherous jungles to confront Captain Croak in an epic showdown! Welcome to "Spawn of the Spore Spectre"!