Single-player games like Main Assembly
Below are 14 single-player Steam games similar to Main Assembly, 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 Main Assembly page.
Ranked picks
- 1
Clank-Robotics
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Build your own robot. Program your robots AI in the Visual Scripting logic editor. Compete against other people's robots in the ranked arena. Build the strongest and smartest robot and win.
- 2
Archean
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Gather resources, craft components, build vehicles, and code their logic in a physics-driven engineering sandbox and full scale space sim.
- 3
Axon Hero
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Axon Hero is more than just a puzzle game - it's a creative playground where logic meets imagination. Build, code, and conquer your way through many hand-crafted challenges, each one more mind-bending than the last.
- 4
World of Contraptions
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
World of Contraptions is a physics-based building game in which you build the most varied contraptions to solve the most diverse types of puzzles. Win dozens of levels with different types of obstacles. Design the best contraption for each challenge using a giant collection of blocks.
- 5
Logic World
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Invent a new computer! Logic World is a first-person sandbox simulation game that's all about digital logic. Play alone or with friends, design unique machines, build up layers of complexity, and experience the joy of circuits!
- 6
GLADIABOTS - AI Combat Arena
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Assemble your robot squad, construct their AI and send them in the battle arena to see your strategy play out. Iterate, improve and repeat until you outsmart all your opponents and friends online.
- 7
ComPressure
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Design increasingly complex computation units powered by high pressure steam. From switches to steam based computers, all in a world of analogue pressure devices. Use previous designs to solve further challenges, unravel the mystery of the missing steam and discover a new field of science.
- 8
MythBusters: The Game - Crazy Experiments Simulator
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Be a MythBuster in front and behind the camera! The game is a first-person sim that adapts the famous Discovery show. Run crazy experiments and manage the production of episodes.
- 9
Scrap Mechanic
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Enter the creative paradise of Scrap Mechanic! Build fantastic machines, go on adventures with your friends and defend against waves of evil Farmbots in this imaginative multiplayer survival sandbox. With Scrap Mechanic’s powerful creation tools you can engineer your own adventures!
- 10
Trailmakers
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Build the ultimate vehicle and explore a vast open world filled with challenges and adventure. Play solo or team up with friends in multiplayer to conquer the toughest obstacles. With a thrilling campaign mode and endless creative possibilities, Trailmakers is the ultimate sandbox for adventurers.
- 11
Minecraft: Story Mode - A Telltale Games Series
Single-player alternative to Main Assembly — playable solo, no multiplayer required.
Episode 1 is now FREE - for a limited time! In Minecraft: Story Mode, playing as either a male or female hero named 'Jesse,' you’ll embark on a perilous adventure across the Overworld, through the Nether, to the End, and beyond.
- 12
Stormworm+
Single-player alternative to Main Assembly — playable solo, no multiplayer required.
Stormworm+ is a Fast-Paced Reflex-Driven Arcade Game backed with colorful visuals and an original soundtrack! Inspired by the arcade games of old, collect, grow and aim for the top spot on the leaderboards!
- 13
Stormworks: Build and Rescue
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
Join a world where you design, create and pilot your own air sea rescue service. Release your inner hero as you battle fierce storms out at sea to rescue those in need.
- 14
SimplePlanes 2
Single-player alternative to Main Assembly — playable solo, no multiplayer required. Shares Simulation with Main Assembly.
SimplePlanes is back! Build planes, cars, or anything else using powerful procedural parts! Explore detailed environments with friends in multiplayer, cause chaos, or download 1,000,000 community crafts for free.