Single-player games like Sci-fi builder
Below are 16 single-player Steam games similar to Sci-fi builder, 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 Sci-fi builder page.
Ranked picks
- 1
Surviving Mars
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Simulation with Sci-fi builder.
There will be challenges to overcome. Execute your strategy and improve your colony’s chances of survival while unlocking the mysteries of this alien world. Are you ready? Mars is waiting for you.
- 2
Oxygen Not Included
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Simulation with Sci-fi builder.
Oxygen Not Included is a space-colony simulation game. Deep inside an alien space rock your industrious crew will need to master science, overcome strange new lifeforms, and harness incredible space tech to survive, and possibly, thrive.
- 3
Stellar Settlers: Space Base Builder
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Simulation with Sci-fi builder.
Stellar Settlers is a chill space base/city builder and colony sim game. With unique vertical and horizontal base-building gameplay, settle on 10 hostile alien planets and build your own thriving colony. Get enough materials to build a physics-based Spaceship and try to escape from disasters.
- 4
Kerbal Space Program
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Simulation with Sci-fi builder.
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
The Last Starship
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Simulation with Sci-fi builder.
The Last Starship is a 2D space construction game where you design and upgrade your starship. Choose your path: pirate hunter, miner, engineer, spacebus driver, and more, whilst exploring vibrant star systems. Enjoy a growing sandbox world, with regular free updates. Your cosmic adventure awaits!
- 6
Hardspace: Shipbreaker
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Simulation with Sci-fi builder.
Equipped with cutting-edge salvaging tech, carve & slice spaceships to recover valuable materials. Upgrade your gear to take on more lucrative contracts and pay your billion credits debt to LYNX Corp!
- 7
Startopia
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Simulation with Sci-fi builder.
A once thriving network of space stations and planets have been left lifeless, redundant scars of the apocalypse. Into this age of darkness comes light. You will lead the way in rebuilding the network of space stations to a standard accepted by the individual alien races, attracting them to harness their expertise and research new...
- 8
Mars Horizon
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Simulation with Sci-fi builder.
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.
- 9
Bomber
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Action and Indie with Sci-fi builder.
Bomber is a fun arcade puzzle game for kids and families. Blast walls, find hidden keys, collect power-ups, and complete 20 exciting levels full of surprises.
- 10
Photo Studio
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Adventure with Sci-fi builder.
Photo Studio is a creative sandbox for photography, fashion, and dance. Pose models, control lighting, film music videos, and design glamorous shoots in VR or non-VR.
- 11
Gang wars
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Action and Indie with Sci-fi builder.
Gang Wars is a fun cartoon arcade shooter! Defeat silly gangsters, collect coins, upgrade weapons, and clear 40 exciting levels full of fast action and funny animations.
- 12
Clip maker
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Simulation with Sci-fi builder.
Clip Maker is a creative tool for making videos, animations, visual novels, comics & VR scenes. Easy to use, packed with assets, and exportable in 4K, 8K, VR, GIF, and more.
- 13
Cyberpunk sex
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Adventure with Sci-fi builder.
Cyberpunk Sex 🔞 is an adult sandbox game in a neon-lit pleasure house. Explore 30 interactive rooms, unlock toys, and enjoy explicit sex scenes with full control and zero shame.
- 14
Runaway bride
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Action and Indie with Sci-fi builder.
Runaway Bride 👰♀️💨 is a funny escape arcade game! Help Rachel run from her chaotic wedding, dodge relatives, grab keys, and sprint through 10 levels of family-fueled wedding madness.
- 15
Sex motel
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Adventure with Sci-fi builder.
Adult erotic motel game 🔞. Explore 21 interactive rooms, join explicit sex scenes, or just watch. Includes a sex gym, toys, LGBTQ+ content, voyeur & participation options.
- 16
Fuck in police
Single-player alternative to Sci-fi builder — playable solo, no multiplayer required. Shares Indie and Adventure with Sci-fi builder.
Fuck in Police 🔞 is an adult erotic sandbox game set in a wild police station. Explore 9 interactive rooms, unlock explicit sex scenes, and join officers in the kinkiest precinct ever.