
M.A.S.S. Builder
App ID | 956680 |
App Type | Game |
Developer | Vermillion Digital |
Publisher | Sekai Project |
Supported Systems | Windows |
Technologies | Unreal Engine, EpicOnlineServices SDK |
Last Changenumber | 31293730 |
Last Record Update | 24 September 2025 – 22:08:29 UTC ( |
Release Date | 15 September 2025 – 00:58:08 UTC ( |
Commander, customize and build your Mechanical Assault Skeleton Suit (M.A.S.S.) and lead the fight against an alien invasion bent on exterminating the human race. The fate of humanity is in your hands.
Additional Information
Developer | Vermillion Digital | |||||||||||||||||||||||||||
metacritic_name | M.A.S.S. Builder | |||||||||||||||||||||||||||
controller_support | full | |||||||||||||||||||||||||||
ReleaseState | released | |||||||||||||||||||||||||||
Publisher | Sekai Project | |||||||||||||||||||||||||||
Store Release Date | 15 September 2025 – 00:58:15 UTC ( |
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osarch | 64 | |||||||||||||||||||||||||||
community_hub_visible | Yes | |||||||||||||||||||||||||||
Social Media | https://discord.gg/sekai-project https://www.facebook.com/massbuilderthegame/ https://www.twitch.tv/sekaiproject https://x.com/massbuildergame https://www.youtube.com/sekaiproject/ |
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Primary Genre | Indie (23) | |||||||||||||||||||||||||||
Store Genres | Action (1), Indie (23), RPG (3), Strategy (2) | |||||||||||||||||||||||||||
Steam Release Date | 15 September 2025 – 00:58:08 UTC ( |
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Store Asset Modification Time | 15 September 2025 – 01:08:19 UTC ( |
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library_assets |
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osextended | empty string | |||||||||||||||||||||||||||
review_score | 8 | |||||||||||||||||||||||||||
review_percentage | 86 | |||||||||||||||||||||||||||
Detected Technologies (?) | Unreal Engine, EpicOnlineServices SDK, Intel_oneTBB SDK, NVIDIA_Nsight_Aftermath SDK, Ogg SDK, Vorbis SDK, XAudio2 SDK | |||||||||||||||||||||||||||
Steam Deck Compatibility |
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Early Access Release Date | 13 September 2019 – 00:00:00 UTC ( |
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First seen on SteamDB | 2 October 2018 – 04:54:40 UTC ( |
Supported Languages
5 Languages | Interface | Full Audio | Subtitles |
---|---|---|---|
English | Yes | Yes | |
Japanese | Yes | Yes | |
Simplified Chinese | Yes | ||
Thai | Yes | ||
Traditional Chinese | Yes |
Tags
Categories








Hardware Categories
Assets
Load all asset imagestrailer_name | M.A.S.S. Builder Full Release Trailer |
trailer_category | 1 |
trailer_480p ↴ | |
video/webm | 257197509/movie480_vp9.webm |
video/mp4 | 257197509/movie480.mp4 |
trailer_max ↴ | |
video/webm | 257197509/movie_max_vp9.webm |
video/mp4 | 257197509/movie_max.mp4 |
microtrailer ↴ | |
video/webm | 956680/874537767/eda40804b771ded2ed01c9f28590f94f5b9aec7c/1757842035/microtrailer.webm |
video/mp4 | 956680/874537767/eda40804b771ded2ed01c9f28590f94f5b9aec7c/1757842035/microtrailer.mp4 |
adaptive_trailers ↴ | |
dash_av1 | 956680/874537767/eda40804b771ded2ed01c9f28590f94f5b9aec7c/1757842035/dash_av1.mpd |
dash_h264 | 956680/874537767/eda40804b771ded2ed01c9f28590f94f5b9aec7c/1757842035/dash_h264.mpd |
hls_h264 | 956680/874537767/eda40804b771ded2ed01c9f28590f94f5b9aec7c/1757842035/hls_264_master.m3u8 |
screenshot_medium | 257197509/ee7146766dfe4916fa00086f9f84b2d196508045/movie_600x337.jpg |
screenshot_full | 257197509/ee7146766dfe4916fa00086f9f84b2d196508045/movie_full.jpg |
all_ages | true |
is_highlight | true |
timestamp | 15 September 2025 – 00:58:10 UTC |
Store Packages
SubID | Name | Price | Last Update | |
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312146 | M.A.S.S. Builder (Not in) | $24.99 |
Packages
SubID | Name | Billing Type | Last Update |
---|---|---|---|
312144 | Steam Sub 312144 | CD Key | |
312145 | M.A.S.S. Builder for Beta Testing | CD Key | |
396109 | M.A.S.S. Builder ( 956680 ) - complimentary reviewer package | No Cost |
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