- Requires a 64-bit processor and operating system
- OS: WINDOWS® 7 (64-bit)
- Processor: Intel® Core™ i3-4160 or AMD equivalent
- Memory: 4 GB RAM
- Graphics: NVIDIA® GeForce® GTX 750 or AMD equivalent
- Storage: 3 GB available space
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Media
About this game
Show more Show less
You’re the designer, engineer and architect if you can imagine it you can create it! Construct robots of any shape or size from eight-legged spider bots to eerie UFO contraptions. Engineer each and every appendage with powerful visual programming letting you dictate the bots every move. When you’ve completed your masterpiece, open the world builder and craft the ultimate obstacle course to push your bot to its limit.
Alone or with fellow inventors, envision your design then make it a reality.
Create a world in which your bots will be challenged. Craft tracks for racing or complex obstacle courses that tease out all those lovely design flaws you didn’t know you had.
Show off your designer skills first-hand with up to three friends. Build worlds together to challenge each other's bots in different obstacles courses and tracks. Or smash each other's creations into metallic pulp (more coming soon).
No friends? No problems. We’ve created a single-player mode with over 100 challenges to test your inventions.
Don’t panic, we don’t expect you to code in C# (we’re doing that). In fact, it’s entirely optional, but if you’re up to the challenge we’ve designed a powerful visual programming tool for you to enhance your creations.
Add (or take) from the thousands of already created bots and worlds hand-crafted by our dedicated fans from all over the globe.
If you want to test the limits of your construction, then drive it off a cliff.
Game features
- Single-player
- Multi-player
- PvP
- Online PvP
- Co-op
- Online Co-op
- Partial Controller Support
- Steam Achievements
- Steam Workshop
- Steam Cloud
- Family Sharing
- Includes level editor
System Requirements
Swipe- Requires a 64-bit processor and operating system
- OS: WINDOWS® 7 (64-bit)
- Processor: Intel® Core™ i5-4460 or AMD equivalent
- Memory: 8 GB RAM
- Graphics: NVIDIA® GeForce® GTX 970 or AMD equivalent
- Storage: 3 GB available space
Player reviews
its very easy to use and so much fun to play with friends
this game is realy nice becus its like trailmakers but you dont have the restrictions of having to use glitches to make difrent formes and even then you are kind of limited but this game just throws everything like th...
News
All news
4 years ago
Main Assembly 1.1 Patch - now live for Beta testing!Hello inventors! We've been working hard to address a lot of feedback and are making the new build available to the community, addressing issues listed a little further down. Please share any feedback via Discord and we'll aim to release to the main branch by late Augus
5 years ago
Main Assembly 1.0 is now available!Inventors, creative minds of the future! Main Assembly, has today left Steam Early Access - and has officially launched! Hooray! Featuring a comprehensive array of freeform building tools, players can now construct an even more significant number of intricate machines a
5 years ago
Main Assembly -- Dev Log #38 Launch, 1.0 & Space!Hey folks! *waves at the screen* We hope everyone had a good end to the year -despite the current situation - and that all of you got off to a solid, creative start in the new year! 2021 will help you push your imagination to its limits, not just your bots! Everyone is
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Activation check
We detected that you are in:
Main Assembly - PC (Steam)
About
You’re the designer, engineer and architect if you can imagine it you can create it! Construct robots of any shape or size from eight-legged spider bots to eerie UFO contraptions. Engineer each and every appendage with powerful visual programming letting you dictate the bots every move. When you’ve completed your masterpiece, open the world builder and craft the ultimate obstacle course to push your bot...
- Platform
- Steam (PC)
- Developer
- Bad Yolk Games
- Publisher
- Team17
- Release date
- 26 Jan, 2021
- Languages
- Genres
- Simulation
- Product type
- Digital key / activates on Steam
Supported languages
| Interface | Audio | Subtitles | |
|---|---|---|---|
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ | |
| ✓ | — | ✓ |
Media



Description
You’re the designer, engineer and architect if you can imagine it you can create it! Construct robots of any shape or size from eight-legged spider bots to eerie UFO contraptions. Engineer each and every appendage with powerful visual programming letting you dictate the bots every move. When you’ve completed your masterpiece, open the world builder and craft the ultimate obstacle course to push your bot to its limit.
![]()
Alone or with fellow inventors, envision your design then make it a reality.
![]()
Create a world in which your bots will be challenged. Craft tracks for racing or complex obstacle courses that tease out all those lovely design flaws you didn’t know you had.
![]()
Show off your designer skills first-hand with up to three friends. Build worlds together to challenge each other's bots in different obstacles courses and tracks. Or smash each other's creations into metallic pulp (more coming soon).
![]()
No friends? No problems. We’ve created a single-player mode with over 100 challenges to test your inventions.
![]()
Don’t panic, we don’t expect you to code in C# (we’re doing that). In fact, it’s entirely optional, but if you’re up to the challenge we’ve designed a powerful visual programming tool for you to enhance your creations.
![]()
Add (or take) from the thousands of already created bots and worlds hand-crafted by our dedicated fans from all over the globe.
![]()
If you want to test the limits of your construction, then drive it off a cliff.
Game features
- Single-player
- Multi-player
- PvP
- Online PvP
- Co-op
- Online Co-op
- Partial Controller Support
- Steam Achievements
- Steam Workshop
- Steam Cloud
- Family Sharing
- Includes level editor
System Requirements
- Requires a 64-bit processor and operating system
- OS
- WINDOWS® 7 (64-bit)
- Processor
- Intel® Core™ i3-4160 or AMD equivalent
- Memory
- 4 GB RAM
- Graphics
- NVIDIA® GeForce® GTX 750 or AMD equivalent
- Storage
- 3 GB available space
- Requires a 64-bit processor and operating system
- OS
- WINDOWS® 7 (64-bit)
- Processor
- Intel® Core™ i5-4460 or AMD equivalent
- Memory
- 8 GB RAM
- Graphics
- NVIDIA® GeForce® GTX 970 or AMD equivalent
- Storage
- 3 GB available space
News

4 years ago
Main Assembly 1.1 Patch - now live for Beta testing!
Hello inventors! We've been working hard to address a lot of feedback and are making the new build available to the community, addressing issues listed a little further down. Please share any feedback via Discord and we'll aim to release to the main branch by late Augus

5 years ago
Main Assembly 1.0 is now available!
Inventors, creative minds of the future! Main Assembly, has today left Steam Early Access - and has officially launched! Hooray! Featuring a comprehensive array of freeform building tools, players can now construct an even more significant number of intricate machines a

5 years ago
Main Assembly -- Dev Log #38 Launch, 1.0 & Space!
Hey folks! *waves at the screen* We hope everyone had a good end to the year -despite the current situation - and that all of you got off to a solid, creative start in the new year! 2021 will help you push your imagination to its limits, not just your bots! Everyone is
Best Reviews
👍 Recommended · Steam player · 26 Jul 2026
its very easy to use and so much fun to play with friends
0 found this helpful
👍 Recommended · Steam player · 15 Jul 2026
this game is realy nice becus its like trailmakers but you dont have the restrictions of having to use glitches to make difrent formes and even then you are kind of limited but this game just throws everything like that out of the window and realy lets you do anything your creativity can imagine
0 found this helpful
Recent Reviews
👍 Recommended · Steam player · 26 Jul 2026
its very easy to use and so much fun to play with friends
0 found this helpful
👍 Recommended · Steam player · 15 Jul 2026
this game is realy nice becus its like trailmakers but you dont have the restrictions of having to use glitches to make difrent formes and even then you are kind of limited but this game just throws everything like that out of the window and realy lets you do anything your creativity can imagine
0 found this helpful






