Steam app 956680 · updated 12 Sep 2026, 22:22 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.
310 hourly samples, with the daily peak drawn over them. Weekends are shaded.
85 months, September 2019 to September 2026. The highest number of people in the game at once, each month, on a time axis -- a gap in the record stays a gap.
The highest number of people in the game at once, each month. Four, because four is as far back as the source keeps anything finer than one figure a month.
31 days, each one the highest figure that day. The source keeps no hourly detail this far back. Weekends are shaded.
31 days as the curve, each the highest figure that day. Behind it, 195 hourly samples from 13 Aug, which is as far back as the source keeps every hour. Weekends are shaded.
12 days as the curve, each the highest figure that day. Behind it, 115 hourly samples. Each dip is a night. Weekends are shaded.
M.A.S.S. Builder was released on 14 Sep, 2025.
| Language | Full audio |
|---|---|
| English | |
| Japanese | |
| Simplified Chinese | |
| Thai | |
| Traditional Chinese |
A blank audio cell means full audio was not marked in the returned language list.
50 developer announcements, Jul 2023 to May 2026 · times in UTC
The original soundtrack for M.A.S.S. Builder is now available on Steam! This soundtrack features 36 tracks by composer, Van Narupai. The download will include both MP3 and FLAC file formats for you to enjoy.
sekaipro_chrisRemember the AMA announcement we had weeks ago? The answers to them are now ready for viewing! Please check them out down below! More answers in the comments section as well, as we exceeded word count in this news posts.Question: I hope to…
V-DGTWe've been hotfixing the 1.0.0 launch of M.A.S.S. Builder all week, hope you all were able to have fun with the things that aren't broken! For now, we'd like to tell you all about what's coming next to M.A.S.S. Builder! Let's get the big…
V-DGTHello! We're finally ready to announce the M.A.S.S. Builder major update 1.0.0! We're finally out of Early Access into full release with this update, completing the whole M.A.S.S. Builder Campaign story! It has been a long journey up to…
V-DGTHello everyone! We have a special announcement instead of a WIP today... It's finally time to say goodbye to Early Access and head into Full Release version 1.0.0 come next week September 14th! It has been a few years now since we first…
V-DGTHello everyone! Today, we're only able to have a short sneak peek of the upcoming mission, but fret not, it's a mysterious and ominous lot to take in! Where in the world is this place, what kind of mission are we assigned to? You'll receive…
V-DGTThe weapons attachment system is finally here in version 1.0.0. As promised last week, we will be giving a whole set of explanations on what it covers, how it works, and the changes that we'll be making with the Bullet Launchers attachment…
V-DGTHello everyone! We're back this week with a showcase full of the up-and-coming weapons attachment system. It's a system that's similar to the launcher's attachment we've had before, but they work on your weapons instead. While we only have…
V-DGTAs promised! Here is a WIP update for the upcoming 1.0.0 update featuring one of the new missions that will be available in the update! This mission will feature an area filled with the highest concentration of Void particles, where Quarks…
V-DGTtl;dr Update will be coming in SeptemberHello everyone. First off, let us apologize for not having frequent updates like before and making the project feels like it's dead. We've been busy working on the various systems to make the next…
V-DGTHello everyone! Sorry for not having any new WIP update for these past months. We are still currently working on giving 0.13.0 its deserved quality thus we don't have any news regarding its release date or time yet. We wanted to post this…
V-DGT{STEAM_CLAN_IMAGE}/34774518/53bccc9a3170a20c86ea5a2275130d0afe581824.png Welcome back to another WIP update for 0.13.0! As we've updated the game with our sharing system a few weeks ago, we've now resumed our work to the story content part…
V-DGT{STEAM_CLAN_IMAGE}/34774518/773f72ae5bda391b50384e3dd19b34f2998b2a0d.png Update 0.12.0 alongside the Mecha Asset Sharing System has been released! For patch notes, refer to this link…
V-DGT{STEAM_CLAN_IMAGE}/34774518/e70a30e0f1838e345c222245dc92e4e61cca4708.png After months of working on the M.A.S.S. we're finally ready to announce the update release timing, which honestly isn't far at all. In fact, we'll be releasing the…
V-DGT{STEAM_CLAN_IMAGE}/34774518/38a9a7e81302f74ab9134c666dbbe9a51a523cef.png Welcome back to another WIP update for 0.12.0. This week, we're talking about the timeline of 0.12.0. Let us just get it straight out, 0.12.0 featuring the M.A.S.S.…
V-DGT{STEAM_CLAN_IMAGE}/34774518/f8f248adb70c02723d1bcf73ae8f00bf90cabbd0.png Welcome back to another WIP update for 0.12.0. We're going all out in showing you the M.A.S.S. or the Mecha Asset Sharing System this week! Hopefully, it will be able…
V-DGT{STEAM_CLAN_IMAGE}/34774518/340dfc101afea5dd1043c710d6827ac440f328cb.png Welcome back to another WIP post for M.A.S.S. Builder, featuring the Assets Sharing System (M.A.S.S.) once again! It's just a small sneak peek to how we've designed…
V-DGT{STEAM_CLAN_IMAGE}/34774518/0ac0a957bfa91ceaf754511662e26effae6f8d08.png Welcome back to another WIP for M.A.S.S. Builder! This week we'll talk about the Tokyo Game Show 2024 event that we've attended last week! First of all, thank you to…
V-DGT{STEAM_CLAN_IMAGE}/34774518/a410afcf9305cfbf437e848850cec3d0c2d06ece.png There are two things we'll talk about today! The first is what was listed in the headlines, M.A.S.S. Builder will be heading to Tokyo Game Show on September 26 - 29 at…
V-DGT{STEAM_CLAN_IMAGE}/34774518/1840d986ff67d79aa753d57a440eb9aea33dd1f8.png Welcome back to a new WIP update for M.A.S.S. Builder, this week featuring our still-in-design M.A.S.S. feature! As the phrasing suggested, we are still designing the…
V-DGT{STEAM_CLAN_IMAGE}/34774518/1f68bba0b080b7fb47984cd766bf6c33787b6d5d.png Hello everyone and welcome back to yet another "What's Next" post of M.A.S.S. Builder update, this time looking towards 0.12.0. While 0.11.x is still being worked on…
V-DGT{STEAM_CLAN_IMAGE}/34774518/f4ae10bd1e73799737b3b0b4111255a35b015c44.png Known Bugs Textures of ground in some area are wonky and appears to be moving Flickering cameras Some tier 7 tech sub-units are not correctly working as intended Weird…
V-DGT{STEAM_CLAN_IMAGE}/34774518/31efc442eb59fe1ebd37f140f9df119db473f6e5.png So a few weeks ago we mentioned some upgrades to the accessories system right? We're now ready to reveal them this week! It's something we called the Socket Alignment…
V-DGTWe are sorry we missed to make a WIP post last week. It's due to some upgrades coming up for the accessories system that we cannot show yet. It'll be coming in a few weeks don't worry. So now, let us tease more new accessories which will…
V-DGT{STEAM_CLAN_IMAGE}/34774518/8810efcda92b65ab4a83994854cf9a6175870fca.png Back to another short WIP update this week, this time showing you the upcoming new accessories to further customize your looks!…
V-DGT{STEAM_CLAN_IMAGE}/34774518/de608a2bde1fc0d5504a9b02a05716d2378499f2.png And here they come in full glory, the Zenith armor set along with their backpacks. We're finally done with the armor set this week and we're excited to show you our…
V-DGT{STEAM_CLAN_IMAGE}/34774518/6de6f7e1cfad72773d92775b8b6c3cd6de752770.png Back to another WIP update for the week! We're featuring the final variant of the new armor set Zenith, the Z variant. For this one, we wanted to emphasize the sharp…
V-DGThttps://ksr-ugc.imgix.net/assets/044/448/222/4284351b20c6f07e837fb146d2d99cb6_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1711212556&gif-q=50&s=42ffe9a9cc8d282b9b238bb75732cdf2 Another WIP is finally here! As we're…
V-DGT{STEAM_CLAN_IMAGE}/34774518/931385b8f24a713481692b1e6e264087345b4d99.png Welcome back to another WIP update. We took some time to ready this HUGE feature update that has been requested ever since the first versions of M.A.S.S. Builder…
V-DGThttps://ksr-ugc.imgix.net/assets/044/116/691/e30136f63968f2aa84e9eb9617071dc8_original.png?ixlib=rb-4.1.0&w=700&fit=max&v=1708792660&gif-q=50&lossless=true&s=1e343d0342a3e4e9f268a9fbf32e251a Did you miss us? We're extremely sorry about the…
V-DGTWelcome back to another news week. There isn't a WIP update this week but we don't want to leave you all hanging with no updates at all so we're here to provide some wrap-up from the Taipei Game Show event we had. We're also bringing in…
V-DGT{STEAM_CLAN_IMAGE}/34774518/435cad17568b87f3944eb513e97df2680b34bec6.png Sorry we took a break, here's some more WIP Progress post of the upcoming 0.11.0 featuring a new armor set!…
V-DGT{STEAM_CLAN_IMAGE}/34774518/b0cbe415e3f37ca27fbcdb6f52ff4120bab2c171.png With weeks of new things being shown, we'd like to dial back to some balance changes we're planning to make to improve the game in 0.11.0 First, let us remind you that…
V-DGThttps://ksr-ugc.imgix.net/assets/043/456/776/4d947b768d1043632a72a2659c55cb4d_original.png?ixlib=rb-4.1.0&w=700&fit=max&v=1703344030&gif-q=50&lossless=true&s=2c38d2f11078c976e19c51b80cd2d31e Welcome back to another WIP post, this week…
V-DGThttps://ksr-ugc.imgix.net/assets/043/336/848/7922cb434ce75b6c53091c13dc0105b8_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1702201956&gif-q=50&s=41978a8bc65eef3fd788414bb59bb1c8 Welcome back to another weekly WIP update.…
V-DGThttps://ksr-ugc.imgix.net/assets/043/260/730/90a71d4fe7a29894cd44b70d8c24c265_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1701547384&gif-q=50&s=3124a06d9eec18dfa12a71dd72edcc4d Welcome back to another WIP update. This week…
V-DGThttps://ksr-ugc.imgix.net/assets/043/115/972/531ed6f0c4973174a40aaa21417e8b24_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1700392822&gif-q=50&s=8adbfd75ea90a248b5ce2c3378c8f048 Continuing a streak of showing exciting…
V-DGThttps://ksr-ugc.imgix.net/assets/043/029/129/b07563bfea8d9f49ae0facf1ef98abde_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1699770345&gif-q=50&s=3cdb44995a658e0018c151afa4744edb With last week's Bullet Shooter's Single fire…
V-DGThttps://ksr-ugc.imgix.net/assets/042/945/635/4c4232f2c89a6e7f762e38d5ed7c3925_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1699105900&gif-q=50&s=9ae5c665ef69d16708e4cfdf0c224eec Last week we mentioned reworking some of our…
V-DGThttps://ksr-ugc.imgix.net/assets/042/868/971/999e2afe5aba4763068193c7150148c6_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1698561592&gif-q=50&s=068ed3a6b58a1bc7a4cf2716b3b99583 Welcome to the first 0.11.0 WIP update! We're…
V-DGTFirst of all, before anything else, we must announce that we're shifting our development engine to Unreal Engine 5 for the next version. Now now, we must ask that you don't panic and assume the game is going into a development hell of…
V-DGThttps://ksr-ugc.imgix.net/assets/042/601/576/a015e7785c05409076afd9f2ea51494b_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1696760179&gif-q=50&s=bd3b1c8dfaf2efeffbd8f13d100eeefd First, before anything else, let us provide…
V-DGTSurprise surprise! We were able to finish our bug hunt and final polishing sooner than expected and we're ready to release our update... so why wait? It's been a really long development cycle this time and we hope we're able to meet some…
V-DGThttps://ksr-ugc.imgix.net/assets/042/423/126/a3ca2fe7fb2174d3789b6099e78b254a_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1695559229&gif-q=50&s=6ddd2676fe6872ac89164cfe5daa0810 Another short update this week as we prepare…
V-DGThttps://ksr-ugc.imgix.net/assets/042/331/104/29815880c97a5a826984a6725235c3de_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1694941443&gif-q=50&s=27d7303f94b4c7fd51222368a62127f0 Short update this week while we're polishing…
V-DGThttps://ksr-ugc.imgix.net/assets/042/238/574/4e47a16a33f39c4927ba553666811af3_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1694272912&gif-q=50&s=d9e37f0d8b21be866e36ee9102cf5570 Welcome back to another WIP update, this week…
V-DGThttps://ksr-ugc.imgix.net/assets/042/158/489/fbca3fd4a1a31d99e1c519657e510a44_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1693652436&gif-q=50&s=1c2e1aa902d6e564a92f12eed97dd6d1 It's the start of September now, where's the…
V-DGThttps://ksr-ugc.imgix.net/assets/042/000/413/b3b8ab92d8f2163113da1a2f5d883b64_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1692449451&gif-q=50&s=5cb31079b1b207bc2112a563ba2fea66 While we're reviewing the feedback of last…
V-DGThttps://ksr-ugc.imgix.net/assets/041/930/644/f3603bfb8caf795da064f26bdca0e992_original.png?ixlib=rb-4.1.0&q=80&blur=false&w=800&fit=true&v=1691914291&gif-q=50&s=567ae01b7f2709706ea954838b1fa125 While later than expected, we do have some…
V-DGThttps://ksr-ugc.imgix.net/assets/041/773/653/2685d42178eb4af377c25dc4f64fd0fa_original.png?ixlib=rb-4.0.2&q=80&blur=false&w=800&fit=true&v=1690650792&gif-q=50&s=d60c8837644f535cff57d1dd8db55bf3 Another short update this week, we're excited…
V-DGTEverything Steam lists as add-on content for this game, newest first. Prices are left out on purpose: the store answers this page in one currency and it is not the reader's.
| Name | Platforms | Released |
|---|---|---|
| M.A.S.S. Builder Soundtrack | WindowsmacOSLinux | 01 May 2026 |
What Steam runs, and with what. Straight from the app configuration.
| Description | Executable | Arguments | Platform | |
|---|---|---|---|---|
| Launch | MASS_Builder.exe | -novr -nohmd | windows 64 |
The folders Steam Cloud syncs. The root is a token Steam uses for a location on your own machine, not a path this page can know.
| Root | Folder | Files |
|---|---|---|
WinAppDataLocal | MASS_Builder/Saved/SaveGames | *.sav |
It runs on public data and somebody's spare time.
https://paypal.me/KintaroPalPay[email protected]0x4d559C765AA8BFe336E36d5b76024926767eD38dTJtctWU9uetJaTBoSybd1RErW7n9duTKVG