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M.A.S.S. Builder

Wishlist Follow Ignore Launch Unwatch Watch
App ID 956680
App Type Game
Developer
Publisher Sekai Project
Supported Systems Windows
Technologies Unreal Engine, EpicOnlineServices SDK
Last Changenumber 39323160
Last Record Update 29 September 2026 – 23:04:10 UTC ()
Release Date 15 September 2025 – 00:58:08 UTC ()
😎 82.02%
4k reviews
7
In-Game
🤖 Mechs 💥 Action RPG 🦹 Character Customization 🤖 Robots 🔫 Gun Customization

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.

Steam price history

Special Promotion, ends 8 October 2026
Current Price -30% $17.49
Lowest Recorded Price -30% $17.49 12 December 2025
Currency Current Price Converted Price Lowest Recorded Price
U.S. Dollar -30% $17.49 $17.49 $17.49 -30% $17.49
SASIA - U.S. Dollar -30% $5.94 $5.94 -66.04% $5.94 -30% $5.94
Russian Ruble -30% 616 ₽ $7.38 -57.76% $4.73 -15% 395 ₽
Indian Rupee -30% ₹ 770 $7.99 -54.27% $5.01 -15% ₹ 483
Ukrainian Hryvnia -30% 360₴ $8.01 -54.20% $6.20 -15% 279₴
Indonesian Rupiah -30% Rp 144899 $8.10 -53.67% $5.70 -15% Rp 101999
Philippine Peso -30% ₱535.50 $8.54 -51.12% $7.46 -15% ₱467.45
Vietnamese Dong -30% 224500₫ $8.63 -50.62% $7.19 -15% 187000₫
CIS - U.S. Dollar -30% $8.74 $8.74 -50.03% $8.74 -30% $8.74
LATAM - U.S. Dollar -30% $8.74 $8.74 -50.03% $8.74 -30% $8.74
MENA - U.S. Dollar -30% $8.74 $8.74 -50.03% $8.74 -30% $8.74
Taiwan Dollar -30% NT$ 285 $8.93 -48.94% $8.93 -30% NT$ 285
Chilean Peso -30% CLP$ 9100 $9.27 -47.00% $8.22 -15% CLP$ 8075
Saudi Riyal -30% 36.04 SR $9.57 -45.26% $9.01 -15% 33.95 SR
Chinese Yuan -30% ¥ 64.40 $9.60 -45.08% $9.60 -30% ¥ 64.40
Kuwaiti Dinar -30% 2.97 KD $9.61 -45.02% $9.61 -30% 2.97 KD
South African Rand -30% R 161.00 $9.64 -44.83% $7.64 -15% R 127.50
Brazilian Real -30% R$ 51,79 $9.90 -43.35% $7.72 -15% R$ 40,36
Kazakhstani Tenge -30% 4480₸ $10.10 -42.24% $6.32 -15% 2805₸
Thai Baht -30% ฿346.50 $10.31 -41.04% $8.06 -15% ฿271.15
Malaysian Ringgit -30% RM42.70 $10.45 -40.22% $9.15 -15% RM37.40
Qatari Riyal -30% 38.49 QR $10.55 -39.62% $10.55 -30% 38.49 QR
Peruvian Sol -30% S/.37.10 $10.69 -38.85% $10.69 -30% S/.37.10
Mexican Peso -30% Mex$ 198.09 $10.83 -38.02% $10.83 -30% Mex$ 198.09
Singapore Dollar -30% S$15.40 $12.03 -31.18% $12.03 -30% S$15.40
Colombian Peso -30% COL$ 41160 $12.37 -29.23% $8.56 -15% COL$ 28475
Japanese Yen -30% ¥ 1960 $12.41 -29.00% $12.41 -30% ¥ 1960
U.A.E. Dirham -30% 46.20 AED $12.57 -28.07% $12.57 -30% 46.20 AED
Uruguayan Peso -30% $U518 $12.85 -26.52% $11.14 -15% $U449
Hong Kong Dollar -30% HK$ 109.20 $13.91 -20.43% $11.80 -15% HK$ 92.65
South Korean Won -30% ₩ 18900 $13.97 -20.07% $13.97 -30% ₩ 18900
New Zealand Dollar -30% NZ$ 25.19 $14.13 -19.19% $13.90 -20% NZ$ 24.79
Canadian Dollar -30% CDN$ 22.75 $16.00 -8.51% $16.00 -30% CDN$ 22.75
Costa Rican Colon -30% ₡7350 $16.07 -8.09% $16.07 -30% ₡7350
Australian Dollar -30% A$ 25.55 $17.71 +1.28% $17.71 -30% A$ 25.55
Euro -30% 17,15€ $19.28 +10.28% $18.88 -20% 16,79€
British Pound -30% £14.69 $19.40 +10.93% $19.40 -30% £14.69
Norwegian Krone -30% 196,00 kr $20.36 +16.46% $14.63 -20% 140,80 kr
Polish Zloty -30% 80,49zł $20.69 +18.31% $18.50 -20% 71,99zł
Israeli New Shekel -30% ₪65.06 $21.17 +21.10% $21.17 -30% ₪65.06
Swiss Franc -30% CHF 19.59 $23.61 +35.01% $23.61 -30% CHF 19.59
Valve suggested prices are shown on package pages.

Price history

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View lowest recorded prices on Steam store pages by using our browser extension.

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 ()
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/
Primary Genre Indie (23)
Store Genres Action (1), Indie (23), RPG (3), Strategy (2)
Steam Release Date 15 September 2025 – 00:58:08 UTC ()
Store Asset Modification Time 15 September 2025 – 01:08:19 UTC () (1757898499)
library_assets
library_capsuleen
library_heroen
library_logoen
library_headeren
logo_position ↴
pinned_positionBottomLeft
width_pct38.22994066546616
height_pct71.96504195361356
osextended empty string
review_score 8
review_percentage 85
Detected Technologies Unreal Engine, EpicOnlineServices SDK, Intel_oneTBB SDK, NVIDIA_Nsight_Aftermath SDK, Ogg SDK, Vorbis SDK, XAudio2 SDK
Steam Deck Compatibility
  • Steam Deck:
  • This game's launcher/setup tool may require the touchscreen or virtual keyboard, or have difficult to read text
  • Entering some text requires manually invoking the on-screen keyboard
  • All functionality is accessible when using the default controller configuration
  • This game shows Steam Deck controller icons
  • In-game interface text is legible on Steam Deck
  • This game's default graphics configuration performs well on Steam Deck
  •  
  • SteamOS:
  • This game runs successfully on SteamOS
  • Note: This game's launcher/setup tool may require a touchscreen or virtual keyboard, or have difficult to read text
  • Note: Entering some text requires manually invoking the on-screen keyboard
  •  
  • category: Playable
  • steamos_compatibility: Compatible
  • steam_machine_compatibility: 2
  • test_timestamp: 17 August 2022 – 00:00:00 UTC
  • tested_build_id: 8052672
  • steam_machine_tests:
    0 ↴
    display3
    token#SteamMachine_TestResult_LauncherInteractionIssues
    1 ↴
    display3
    token#SteamMachine_TestResult_TextInputDoesNotAutomaticallyInvokesKeyboard
    2 ↴
    display4
    token#SteamMachine_TestResult_DefaultControllerConfigFullyFunctional
    3 ↴
    display4
    token#SteamMachine_TestResult_ControllerGlyphsMatchDevice
    4 ↴
    display4
    token#SteamMachine_TestResult_DefaultConfigurationIsPerformant
  • configuration:
    supported_inputgamepad
    requires_manual_keyboard_invoke1
    requires_non_controller_launcher_nav1
    primary_player_is_controller_slot_00
    non_deck_display_glyphs0
    small_text0
    requires_internet_for_setup0
    requires_internet_for_singleplayer0
    recommended_runtimeproton-7.0-3
    requires_h2640
    requires_voice_files0
    gamescope_frame_limiter_not_supported0
    hdr_support0
    requires_proton_soundfonts0
Early Access Release Date 13 September 2019 – 00:00:00 UTC ()
First seen on SteamDB 2 October 2018 – 04:54:40 UTC (), in changelist #5167157

Supported Languages

5 Languages Interface Full Audio Subtitles
English Yes Yes
Japanese Yes Yes
Simplified Chinese Yes
Thai Yes
Traditional Chinese Yes

Assets

Load all asset images
clienticon affd7b7f00e364ecb9aab6ceb83e655c62557d1f
clienttga 109679be02b3f9cbe716b57df478b0f64753459a
icon 5a475c6f3f12c22870ed0b85b56a19c2554cc79a
logo 3417d7c159095e4c7d66a003092f10fe6d9565b7
logo_small 3417d7c159095e4c7d66a003092f10fe6d9565b7_thumb
small_capsule
englishb193852336fb1c73ad226ee0ae220a1a5ecb6f86/capsule_231x87.jpg
header_image
english3cb00cda71cd62e86eac4258c7678255610c0cfb/header.jpg
library_assets_full
library_capsule ↴
image/englishlibrary_600x900.jpg
image2x/englishlibrary_600x900_2x.jpg
library_hero ↴
image/englishlibrary_hero.jpg
image2x/englishlibrary_hero_2x.jpg
library_logo ↴
image/englishlogo.png
image2x/englishlogo_2x.png
logo_position/pinned_positionBottomLeft
logo_position/width_pct38.22994066546616
logo_position/height_pct71.96504195361356
library_header ↴
image/english3cb00cda71cd62e86eac4258c7678255610c0cfb/library_header.jpg
image2x/english3cb00cda71cd62e86eac4258c7678255610c0cfb/library_header_2x.jpg
Assets
main_capsule40c93e6d51530d850aae6d693ce931d64a1df81a/capsule_616x353.jpg
main_capsule_2x40c93e6d51530d850aae6d693ce931d64a1df81a/capsule_616x353_2x.jpg
small_capsuleb193852336fb1c73ad226ee0ae220a1a5ecb6f86/capsule_231x87.jpg
small_capsule_2xb193852336fb1c73ad226ee0ae220a1a5ecb6f86/capsule_231x87_2x.jpg
header3cb00cda71cd62e86eac4258c7678255610c0cfb/header.jpg
header_2x3cb00cda71cd62e86eac4258c7678255610c0cfb/header_2x.jpg
page_backgroundpage_bg_generated_v6b.jpg
hero_capsule4500b7fd48da1e9a4ee8913c10826d3bc6b58f52/hero_capsule.jpg
hero_capsule_2x4500b7fd48da1e9a4ee8913c10826d3bc6b58f52/hero_capsule_2x.jpg
library_capsulelibrary_600x900.jpg
library_capsule_2xlibrary_600x900_2x.jpg
library_herolibrary_hero.jpg
library_hero_2xlibrary_hero_2x.jpg
community_icon5a475c6f3f12c22870ed0b85b56a19c2554cc79a.jpg
page_background_pathapp/956680
raw_page_backgroundpage_bg_raw.jpg
last_modified15 September 2025 – 01:08:27 UTC
timestamp15 September 2025 – 01:08:27 UTC

Trailer 977858 ↴

trailer_name M.A.S.S. Builder Full Release Trailer
trailer_category 1
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
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