Released Jan 26, 2021 $19.99 Very Positive Counts toward your Steam games

Main Assembly

By Bad Yolk Games · published by Team17

3D Online Co-Op Co-op Singleplayer Sandbox Building Simulation Programming RobotsPhysicsScienceArtificial Intelligence

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Followers —

Reviews 1,005 Very Positive

Players yesterday 5 at the busiest moment

Owners 50K–100K estimated

Main Assembly is a game tagged 3D, Online Co-Op and Co-op by Bad Yolk Games, released Jan 26, 2021. It has 1,005 Steam reviews (Very Positive). It has an estimated 50K–100K owners on Steam. The Steam games most like it include Technicity, Evercraft Mechanic: Sandbox and NAND².

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.

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<a href="https://launchrivals.com/games/1078920-main-assembly"><img src="https://launchrivals.com/games/1078920/badge.png" alt="Main Assembly launch date" width="320" height="84"></a>

<a href="https://launchrivals.com/games/1078920-main-assembly"><img src="https://launchrivals.com/games/1078920/badge.png?theme=light" alt="Main Assembly launch date" width="320" height="84"></a>

Technicity 61% match · 3D, Online Co-Op, Co-op
Evercraft Mechanic: Sandbox 56% match · 3D, Singleplayer, Sandbox
NAND² 54% match · Online Co-Op, Co-op, Singleplayer
Infinite Rails 54% match · 3D, Online Co-Op, Co-op
Rest Area Simulator 53% match · 3D, Online Co-Op, Co-op
Blue Collar'd 52% match · 3D, Online Co-Op, Co-op
Homespace 52% match · 3D, Online Co-Op, Co-op
Crazy Hotel Together 52% match · 3D, Online Co-Op, Co-op
Mars First Logistics 51% match · 3D, Co-op, Singleplayer
A Million Trees 51% match · 3D, Online Co-Op, Co-op

Steam data

Everything Steam lists for Main Assembly · record updated 1 day ago

Steam store

Overview

App ID1078920

Release dateJan 26, 2021

Last change number39323160

Last record update1 day ago

App type: Game
Developer: Bad Yolk Games
Publisher: Team17
Steam profile: Counts toward game count and achievement totals · checked Nov 1, 2025
Franchise: Team17

Windows 64-bit

Steam Deck: Playable
Controller: Partial support

Single-playerMulti-playerCo-opOnline co-opSteam WorkshopSteam CloudSteam AchievementsPartial controller supportPvPOnline PvPIncludes level editorFamily Sharing

Patches

Build	Branch	Updated
7045205	experimental	Jul 19, 2021
6123531	public	Jan 26, 2021

Depots

ID	Name	Systems	Size	Download	Manifest
228988	— shared from 228980	Windows	—	—	—
228990	— shared from 228980	Windows	—	—	—
1078921	—	Windows	3.13 GB	1.17 GB	6356761184168946664

Branch	Build	Updated	Access
public	6123531	Jan 26, 2021	Open
experimental Experimental branch with untested (but great!) changes. Use at your own risk!	7045205	Jul 19, 2021	Open

Configuration

Install foldersteamapps/common/Main Assembly

Executable	Arguments	Systems	Description
MainAssembly.exe		Windows

Space per player953.7 MB

Filesup to 10,000

Save locations4

Root	Path	Pattern	Systems
WinAppDataLocal	RoboBuild/Saved/bots	*	All
WinAppDataLocal	RoboBuild/Saved/SaveGames	*.sav	All
WinAppDataLocal	RoboBuild/Saved/levels	*	All
WinAppDataLocal	RoboBuild/Saved/kits	*	All

Data from public Steam pages, updated daily; 1 day of history. Owner counts are estimates. LaunchRivals is not affiliated with Valve or Steam.

Main Assembly

About Main Assembly

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