Main Assembly

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App ID	1078920
App Type	Game
Developer	Bad Yolk Games
Publisher	Team17
Supported Systems	Windows
Technologies	Unreal Engine
Last Changenumber	28983991
Last Record Update	14 May 2025 – 15:23:44 UTC ()
Release Date	26 January 2021 – 16:00:00 UTC ()

😎 80.78%

1k reviews

In-Game

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.

Additional Information

Developer

Bad Yolk Games

metacritic_name

Main Assembly

controller_support

partial

community_visible_stats

Yes

workshop_visible

Yes

ReleaseState

released

Publisher

Team17

eulas

0 ↴
id	1078920_eula_0
name	Main Assembly EULA
url	https://store.steampowered.com//eula/1078920_eula_0
version	1

Store Release Date

26 January 2021 – 16:01:15 UTC ()

osarch

community_hub_visible

Yes

Social Media

https://discord.gg/mainassembly
https://www.facebook.com/BadYolkGames/
https://www.twitch.tv/badyolkgames
https://x.com/BadYolkGames
https://www.youtube.com/channel/UChbuHV7NUa4P69fiy5zDOhw/

Primary Genre

Simulation (28)

Store Genres

Simulation (28)

Steam Release Date

26 January 2021 – 16:00:00 UTC ()

Store Asset Modification Time

10 November 2022 – 09:04:06 UTC () (1668071046)

library_assets

library_capsule	en
library_hero	en
library_logo	en
logo_position ↴
pinned_position	CenterCenter
width_pct	66.82206724376545
height_pct	100

osextended

empty string

review_score

review_percentage

Detected Technologies (?)

Unreal Engine, CEF SDK, NVIDIA_APEX SDK, NVIDIA_Nsight_Aftermath SDK, NVIDIA_PhysX SDK, NvCloth SDK, Ogg SDK, Vorbis SDK

Steam Deck Compatibility

Steam Deck:
Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
This game sometimes shows mouse, keyboard, or non-Steam-Deck controller icons
Entering some text requires manually invoking the on-screen keyboard
In-game interface text is legible on Steam Deck
This game's default graphics configuration performs well on Steam Deck
Note: This game does not default to external Bluetooth/USB controllers on Deck, and may require manually switching the active controller via the Quick Access Menu
SteamOS:
This game runs successfully on SteamOS
Note: Entering some text requires manually invoking the on-screen keyboard
Note: Some functionality is not accessible when using the default controller configuration, requiring use of the touchscreen or virtual keyboard, or a community configuration
Note: This game does not default to external Bluetooth/USB controllers on SteamOS, and may require manually switching the active controller via the Quick Access Menu
category: Playable
steamos_compatibility: Compatible
test_timestamp: 5 March 2022 – 00:00:00 UTC
tested_build_id: 6123531

configuration:

supported_input	gamepad
requires_manual_keyboard_invoke	1
requires_non_controller_launcher_nav	0
primary_player_is_controller_slot_0	1
non_deck_display_glyphs	1
small_text	0
requires_internet_for_setup	0
requires_internet_for_singleplayer	0
recommended_runtime	proton-experimental
requires_h264	0
requires_voice_files	0
gamescope_frame_limiter_not_supported	0
hdr_support	0

Early Access Release Date

11 June 2020 – 00:00:00 UTC ()

First seen on SteamDB

30 April 2019 – 12:27:56 UTC (), in changelist #6175879

Supported Languages

10 Languages	Interface	Full Audio	Subtitles	Achievements
English	Yes	Yes	Yes	Yes
French	Yes		Yes	Yes
Italian	Yes		Yes	Yes
German	Yes		Yes	Yes
Spanish - Spain	Yes		Yes	Yes
Russian	Yes		Yes	Yes
Simplified Chinese	Yes		Yes	Yes
Traditional Chinese	Yes		Yes	Yes
Portuguese - Brazil	Yes		Yes	Yes
Japanese	Yes		Yes	Yes

Hardware Categories

Partial Controller Support

Assets

Load all asset images

clienticon

c6dac08bbaf164918a980933f4029c90ddd676b5

clienttga

5ba9ec1e31222a541c77a09ad74999a7c75caa41

icon

372ee3533572c5b29a5fffd0f096b3cdc9c8e8f9

logo

73710968d1adda2b6fcee1cb9e319f617891a5e1

logo_small

73710968d1adda2b6fcee1cb9e319f617891a5e1_thumb

small_capsule

english

capsule_231x87.jpg

header_image

english

header.jpg

library_assets_full

library_capsule ↴
image/english	library_600x900.jpg
image2x/english	library_600x900_2x.jpg
library_hero ↴
image/english	library_hero.jpg
image2x/english	library_hero_2x.jpg
library_logo ↴
logo_position/pinned_position	CenterCenter
logo_position/width_pct	66.82206724376545
logo_position/height_pct	100
image/english	logo.png

Assets

main_capsule	capsule_616x353.jpg
small_capsule	capsule_231x87.jpg
header	header.jpg
page_background	page_bg_generated_v6b.jpg
hero_capsule	hero_capsule.jpg
library_capsule	library_600x900.jpg
library_capsule_2x	library_600x900_2x.jpg
library_hero	library_hero.jpg
library_hero_2x	library_hero_2x.jpg
community_icon	372ee3533572c5b29a5fffd0f096b3cdc9c8e8f9.jpg
page_background_path	app/1078920
raw_page_background	page_bg_raw.jpg
timestamp	15 October 2024 – 14:38:28 UTC

Trailers

256819722 ↴
trailer_name	Release Out of Early Access
trailer_category	0
trailer_480p/video/webm	256819722/movie480_vp9.webm
trailer_480p/video/mp4	256819722/movie480.mp4
trailer_max/video/webm	256819722/movie_max_vp9.webm
trailer_max/video/mp4	256819722/movie_max.mp4
microtrailer/video/webm	1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/microtrailer.webm
microtrailer/video/mp4	1078920/343310/da2e717a7db9da6cd4d10251b0232bfd0ec1b8ed/1750613137/microtrailer.mp4
screenshot_medium	256819722/movie.293x165.jpg
screenshot_full	256819722/movie_full.jpg
trailer_base_id	343310
all_ages	true
is_highlight	true
timestamp	1628160512
256817430 ↴
trailer_name	Release Date Announcement
trailer_category	0
trailer_480p/video/webm	256817430/movie480_vp9.webm
trailer_480p/video/mp4	256817430/movie480.mp4
trailer_max/video/webm	256817430/movie_max_vp9.webm
trailer_max/video/mp4	256817430/movie_max.mp4
microtrailer/video/webm	1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/microtrailer.webm
microtrailer/video/mp4	1078920/339053/daf19dca0451c3437c4da559b3c5e414f739ac73/1750613131/microtrailer.mp4
screenshot_medium	256817430/movie.293x165.jpg
screenshot_full	256817430/movie_full.jpg
trailer_base_id	339053
all_ages	true
is_highlight	true
timestamp	1610039868
256808807 ↴
trailer_name	Bot Brawl Update Trailer
trailer_category	0
trailer_480p/video/webm	256808807/movie480_vp9.webm
trailer_480p/video/mp4	256808807/movie480.mp4
trailer_max/video/webm	256808807/movie_max_vp9.webm
trailer_max/video/mp4	256808807/movie_max.mp4
microtrailer/video/webm	1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/microtrailer.webm
microtrailer/video/mp4	1078920/325402/04ad2cd2c8477bb2d6fe4fae8453ebc474d6f5e5/1750613127/microtrailer.mp4
screenshot_medium	256808807/movie.293x165.jpg
screenshot_full	256808807/movie_full.jpg
trailer_base_id	325402
all_ages	true
is_highlight	true
timestamp	1605093667
256800068 ↴
trailer_name	1k Workshop Creations
trailer_category	0
trailer_480p/video/webm	256800068/movie480_vp9.webm
trailer_480p/video/mp4	256800068/movie480.mp4
trailer_max/video/webm	256800068/movie_max_vp9.webm
trailer_max/video/mp4	256800068/movie_max.mp4
microtrailer/video/webm	1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/microtrailer.webm
microtrailer/video/mp4	1078920/310541/ee62fae87f029891a8bb4aaf1fe6c63366a446c0/1750613126/microtrailer.mp4
screenshot_medium	256800068/movie.293x165.jpg
screenshot_full	256800068/movie_full.jpg
trailer_base_id	310541
all_ages	true
is_highlight	true
timestamp	1610039884
256789387 ↴
trailer_name	FGS Trailer
trailer_category	0
trailer_480p/video/webm	256789387/movie480_vp9.webm
trailer_480p/video/mp4	256789387/movie480.mp4
trailer_max/video/webm	256789387/movie_max_vp9.webm
trailer_max/video/mp4	256789387/movie_max.mp4
microtrailer/video/webm	1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/microtrailer.webm
microtrailer/video/mp4	1078920/292602/b9829405cf290fa4dd20ff94c4f878f33ef21a88/1750613112/microtrailer.mp4
screenshot_medium	256789387/movie.293x165.jpg
screenshot_full	256789387/movie_full.jpg
trailer_base_id	292602
all_ages	true
timestamp	1604938311

User File System

Key

Value

quota

953.67 MiB (1000000000)

maxnumfiles

10000

savefiles

0 ↴
root	WinAppDataLocal
path	RoboBuild/Saved/bots
pattern	*
recursive	1
2 ↴
root	WinAppDataLocal
path	RoboBuild/Saved/SaveGames
pattern	*.sav
3 ↴
root	WinAppDataLocal
path	RoboBuild/Saved/levels
pattern	*
recursive	1
4 ↴
root	WinAppDataLocal
path	RoboBuild/Saved/kits
pattern	*
recursive	1

Save File Locations

Based on the configuration above, this is where we think the save files are located.

Platform	Path	Pattern
[All OSes]	%USERPROFILE%/AppData/Local/RoboBuild/Saved/bots	*
[All OSes]	%USERPROFILE%/AppData/Local/RoboBuild/Saved/SaveGames	*.sav
[All OSes]	%USERPROFILE%/AppData/Local/RoboBuild/Saved/levels	*
[All OSes]	%USERPROFILE%/AppData/Local/RoboBuild/Saved/kits	*

Main Assembly

Additional Information

Supported Languages

Tags

Categories

Hardware Categories

Assets

User File System

Save File Locations