Single-player games like Science Simulator
Below are 8 single-player Steam games similar to Science Simulator, 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 Science Simulator page.
Ranked picks
- 1
Mars Horizon
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Simulation with Science Simulator.
Lead a major space agency as you guide humanity to Mars in this strategy simulation game. Construct a base, design and build rockets, conduct missions throughout the Solar System, and write your own history of Space exploration. Created with support from the European Space Agency.
- 2
PlanetMars3D: Spirit Mission
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Adventure with Science Simulator.
Explore Mars in 3D through real Pancam photographs from NASA's Spirit rover. Glide between images with detail that sharpens as you approach, and skim thousands of rover photos at a glance — manual mode, slideshow, or automated flythrough. Photo credit: JPL / NASA / Cornell / ASU
- 3
ALIGNMENT : An Engineering Odyssey
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Adventure with Science Simulator.
A professional-grade road design sim built on real-world maps. Recreate complex interchanges and iconic highways 1:1, engineer custom solutions with real workflows, and drive what you design.
- 4
Rocket Inc
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Adventure with Science Simulator.
Help build mankind's last magnificent structure in this game where you carry out transport missions between planets in the solar system. Build your company and prepare to take off! Earn humankind's respect with more missions.
- 5
In The Long Run The Game
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Adventure with Science Simulator.
Build and manage your space base - Survive in extreme environments - Explore Open World scenarios based on real topographic data - Gather Resources, Craft your items - Drive futuristic rovers and more...
- 6
Off World Racing
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Simulation with Science Simulator.
Race across the Solar System in a realistic vision of humanity's future motorsport. Conquer the Moon's low gravity, drift through Martian dust storms, master the frozen plains of Europa, and explore the methane seas of Titan. Every world changes the race.
- 7
Homebrew - Patent Unknown
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Adventure with Science Simulator.
Unleash your creativity and craft anything from flying cars to jet-powered toilets.Fair warning: there's a learning curve. But once you've got it, the sky's the limit for your creations!While active development is paused, we focus preserving the game and keeping it accessible.
- 8
OVERVIEW (A Walk Through The Universe)
Single-player alternative to Science Simulator — playable solo, no multiplayer required. Shares Indie and Simulation with Science Simulator.
Overview is a mind-changing experience about our position in the Universe. With a narrative and an interactive mode, it features realistic imagery and accurate data to leave you in awe and wonder at the vastness of the Cosmos.