Single-player games like Space Simulation Toolkit
Below are 8 single-player Steam games similar to Space Simulation Toolkit, 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 Space Simulation Toolkit page.
Ranked picks
- 1
Lunar Odyssey
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Simulation and Early Access with Space Simulation Toolkit.
Don your xEMU Spacesuit, explore the Orontius Crater, and Lunar Module in an immersive first-person VR experience with out of this world accuracy and interaction. Follow real-life procedures, launch the Apollo-era Lunar Module, play Space Golf, and experience the moon like never before.
- 2
Meco Rocket Simulator
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Simulation and Early Access with Space Simulation Toolkit.
Meco Rocket Simulator is a realistic physics game where you play as an underpaid rocket scientist working for Mecodyne to design and test rocket engines without regard for your safety.
- 3
Kerbal Space Program
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Indie and Simulation with Space Simulation Toolkit.
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.
- 4
Soyuz Constructors
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Indie and Simulation with Space Simulation Toolkit.
Become a pioneer of spaceflight. As an engineer in the Soviet Space Program you will be responsible for repairing, fixing and building the iconic spacecraft and rockets from the R-7 family.
- 5
StarbaseSim
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Simulation and Early Access with Space Simulation Toolkit.
Operate the Starship space launch system and learn how to catch a rocket to understand what it takes to colonize Mars in this ever-evolving simulation of SpaceX Starbase Texas.
- 6
World Climate Lab
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Indie and Simulation with Space Simulation Toolkit.
World Climate Lab is a real-time planetary climate simulator. Import your own terrain or sculpt a world in the topography editor, then watch a living climate emerge from physics: winds, oceans, cloud bands and ice. Every climate is calculated, not painted.
- 7
Celestial Golf
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Indie with Space Simulation Toolkit.
It’s 2D golf on an astronomical scale. Bite-sized missions will teach you the techniques of real space flight, without having to worry about fuel or crew. Precisely plan orbital trajectories over the moons of Mars, through the rings of Saturn, and boldly go where no golf ball has gone before.
- 8
Spaceflight Simulator 2
Single-player alternative to Space Simulation Toolkit — playable solo, no multiplayer required. Shares Indie and Simulation with Space Simulation Toolkit.
Build rockets and fly them around the Solar System in this realistic aerospace sandbox. Attempt landings, build space stations, drive rovers, perform spacewalks, explore alien worlds, and get your crew home safe.