Single-player games like Solar Sandbox
Below are 8 single-player Steam games similar to Solar Sandbox, 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 Solar Sandbox page.
Ranked picks
- 1
Inspiral: Echoes of Gravity
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
Start as an asteroid, grow by absorbing other celestial bodies to become a planet, a star, and ultimately a black hole. Experience realistic gravity and orbital physics in an ever-evolving sandbox universe.
- 2
GalactiWar - Empire Simulator
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
Watch empires rise and fall, or intervene with godly powers, in GalactiWar, a space empire simulation sandbox game.
- 3
Pure Idle
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
Become the right hand of the Creator in the search for lost perfection. Collect the light of billions of stars, guiding them into the heart of a black hole to find the one — Pure Idle. Technologies, production chains, and a long journey to the most beautiful star in the universe.
- 4
PLANETOON
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
A space puzzle game where you create galaxies. Discover cosmic surprises and over 60 endings. Complete the ending collection to unlock Endless Mode, and see how far your own galaxy can grow.
- 5
Galactic Simulator2: Stargate
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
Galactic Simulator 2: Stargate is a roguelite simulation game inspired by the Fermi Paradox and the Great Filter. Pilot your ship, gather resources, build stargates, and discover other civilizations as you explore an ever-evolving galaxy.
- 6
Heliopedia
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
A fictional universe sandbox/exploration game. 🪐☄️✨ Shape your own solar system by terraforming planets. Find new species and make beautiful ecosystems . . . or breed destruction with volcanos, lightning storms and wildfires!
- 7
The Apple Simulator 2
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
You are an apple. Truly. Red, shiny, alive. No movement. You just stay still. You're being observed. Sometimes, the light changes you. But you're always the same: an apple. So, can just standing still... be a game? There’s no movement in this game. No jumping. No enemies. You simply exist.
- 8
Universe Sandbox
Single-player alternative to Solar Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Solar Sandbox.
Create & destroy on an unimaginable scale with a realistic physics-based space simulator. Explore the beauty of our universe and the fragility of our planet. Use science to bend the laws of gravity, collide planets, boil away oceans, fire epic space lasers, and customize your universe.