Single-player games like Universe Sandbox
Below are 13 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
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.
- 3
SPORE™
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Simulation with Universe Sandbox.
Be the architect of your own universe with Spore, an exciting single-player adventure. From Single Cell to Galactic God, evolve your creature in a universe of your own creations.
- 4
Solar 2
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Dynamic abstract sandbox universe. Changes and evolves as you do.
- 5
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.
- 6
Teardown
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
Prepare the perfect heist in a fully destructible, simulated voxel world. Tear down walls with vehicles or use explosives to create your own shortcuts. Shape the environment to your advantage in the most creative ways you can imagine. Play solo or with up to 12 players in multiplayer.
- 7
WorldBox - God Simulator
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Indie and Simulation with Universe Sandbox.
WorldBox is the ULTIMATE god simulator and sandbox game. A petri dish for your fantasy civilizations. Create your own world or destroy it using many powers. Watch civilizations grow, form kingdoms, colonize new lands, sail to far continents, wars to ignite, empires to fall and towns to burn!
- 8
Distant Worlds: Universe
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Simulation with Universe Sandbox.
Distant Worlds is a vast, pausable real-time 4X space strategy game. Experience the full depth and detail of turn-based strategy, but with the simplicity and ease of real-time, and on the scale of a massively-multiplayer online game.
- 9
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.
- 10
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.
- 11
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!
- 12
Europa Universalis IV
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Simulation with Universe Sandbox.
Rule your land and dominate the world with unparalleled freedom, depth and historical accuracy. Write a new history of the world and build an empire for the ages.
- 13
Crusader Kings II
Single-player alternative to Universe Sandbox — playable solo, no multiplayer required. Shares Simulation with Universe Sandbox.
Explore one of the defining periods in world history in an experience crafted by the masters of Grand Strategy.