Single-player games like Universe Sandbox
Below are 16 single-player Steam games similar to Universe 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 Universe Sandbox page.
Ranked picks
- 1
SpaceEngine
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
The world's first science-based photorealistic interactive 3D planetarium that models the entire Universe, using procedural generation for uncharted areas.
- 2
Terra Logic
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Sculpt planets and landscapes, watch water and climate respond, and compare two versions of the same world. Import heightmaps, draw mountain ranges, and export flat terrain to Minecraft Java. Explore Earth, ancient continents and distant worlds at your own pace.
- 3
SunaBox - The Particle Sandbox That Remembers
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Paint 27 kinds of matter. Set it on fire. Then press rewind. SunaBox is a physics sandbox in the spirit of the legendary OE-CAKE, on a bit-exact engine: every session can be replayed, rewound, saved, and shared to reproduce your world perfectly.
- 4
Kerbal Space Program
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
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.
- 5
Space Crash Simulator
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Real-time planetary collision sandbox powered by SPH physics: smash planets together and watch the destruction and its aftermath!
- 6
Wuli Sandbox
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
In this physics-based particle sandbox, everything is in flux: water, steam, ice, magma, acid... Blast it. Wreck it. Build it!
- 7
Alchemy Laboratory: Simulator
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Dive into a world of creation and discovery, where each element combines to form new ones. Experiment freely in this interactive sandbox. But be careful: every combination has its consequences..
- 8
Sediment
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
A pixel-physics sandbox. Fifty materials, and every one of them is physics: sand finds its angle, water freezes, lava crusts into stone, gunpowder blows. Build your own materials and worlds, and share them in the Workshop.
- 9
Starvector
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie with Universe Sandbox.
Eat a snack while you watch an entire planet burn in your image.
- 10
Space Engineers
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
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.
- 11
Tiny Civilization
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required.
This is a historical simulation game that promotes the development of civilization based on the match-3 Game. You'll need to gather resources, use skills, discover new technology, and lead humanbeing through a 10,000-year journey to the cosmos.
- 12
Sky Settlers
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Sky Settlers is a minimalistic city building card game in which you build on islands in the sky and encounter different events, disasters and much more. Use different cards, complete quests and unlock new tiles as you progress.
- 13
Caesar™ 3
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Simulation with Universe Sandbox.
Prove your strength of mind and spirit and you just may be crowned Caesar!
- 14
Stellaris
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Simulation with Universe Sandbox.
Explore a galaxy full of wonders in this sci-fi grand strategy game from Paradox Development Studios. Interact with diverse alien races, discover strange new worlds with unexpected events and expand the reach of your empire. Each new adventure holds almost limitless possibilities.
- 15
Colony Survival
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie with Universe Sandbox.
Colony Survival is a unique first-person strategy game developed by a two-man team. Build your own colony in a voxel world. Command guards, farmers, miners and other colonists. Defend your colony against the horde of monsters that attacks every night!
- 16
Universe Sandbox Legacy
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Create and destroy on a scale you’ve never imagined!