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M.A.S.S. Builder
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.
In short, Steam reviewers most often praise “Extensive mech customization” (49 of 87 reviews) and “Rewarding upgrade trees” (5); the most common complaint is “Clunky, shallow combat” (20). What reviewers agree on ↓
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-28 · quoted reviews as of 2026-05-13.
What reviewers agree on
49 of the 87 reviews raise this.
“im remaking my review because i was expressing some frustrations and i dont want to just say my negative opinions but also my positives and what i would do to fix it. i still would not recommend this game sadly because…”
5 of the 87 reviews raise this.
5 of the 87 reviews raise this.
“Very intricate mech customization. (Love the glowing colors.) So far the plot is interesting. Very nice menu and GUI in general. Combat isn't as intricate as MechWarrior but even on normal can provide some challenge…”
4 of the 87 reviews raise this.
4 of the 87 reviews raise this.
20 of the 87 reviews raise this · 15 of them still recommend the game.
“If you want to build a mech, buy it. if you want great combat with the build aspect, look elsewhere. Mainly a summary of what most people say when they can't recommend it. I agree. when you get into the game further…”
“I read all negative reviews and made a List: - Ai seams to be to stupid and not challenging - small masses of enemys are seen as annoying when you fight a boss, most players feel like its not a boss fight and more like…”
8 of the 87 reviews raise this · 5 of them still recommend the game.
“Boring ass game, everything's a bullet sponge and the combat system is clunky and unfun. the customization does NOT make up for this either. the paint system alone is unfriendly to new and even experienced users, and is…”
“Lots of fun. A great blend of Gundam and Pacific Rim. My only real criticism is that the painting needs another pass. It can be very specific, and that's great, however doing a quick paint job can be way to time…”
6 of the 87 reviews raise this · 3 of them still recommend the game.
“While this is a promissing game and I had some fun, there was some un-fun moments.. After the AMA, the devs promissed updates (dev notes on their works).. even after a grace period, its been over 6 months in absolute…”
“The developers have not sent out physical backer rewards after the full 1.0 release, as they had promised, and have ignored requests for updates.”
“Preface: Remember that this is a small indie company trying their hand in a fast, giant mech genre that is few and far in between. Cons: -the game has some bugs and the one that I found in particular didn't have any…”
6 of the 87 reviews raise this · 5 of them still recommend the game.
“"Mom, can we have Gundam Breaker?" "We have Gundam Breaker at home" Gundam Breaker at home: [edit after some more playing]: don't go in expecting Armored Core or you'll be seriously disappointed, as the quote at the top…”
6 of the 87 reviews raise this · 5 of them still recommend the game.
“If you want to build a mech, buy it. if you want great combat with the build aspect, look elsewhere. Mainly a summary of what most people say when they can't recommend it. I agree. when you get into the game further…”
Counted across 87 English reviews, sampled to match this game's 84.9% positive rating · as of 2026-05-13
“I am only recommending this game to those who like building model kits and mech customization. The combat is not good and very janky but the amount of customization you can make in a mech is very satisfying.”
— a player, Steam review · 55 hrs played“This is a good game. But it is just not popular. This title has done something that many other titles failed to do. Give you access to a great deal of customization that allows you to create fan made versions of mecha from popular media, be it animated or just drawn. You can…”
— a player, Steam review · 157 hrs played“Let me start by saying I've very much enjoyed this game. (I mean, I've played 510 hours, lol.) It has some of the best customization I've seen for a mecha game. One of its greatest features by far, is the separation of looks from stats. No clown-suiting, like in so many other…”
— a player, Steam review · 510 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-06 via SteamCharts.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-10-21). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
M.A.S.S. Builder Original Soundtrack Now Available On Steam
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
Post 1.0.0. AMA Answers!
Remember 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
Post 1.0.0. What's Next + AMA Announcement!
We'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 t
M.A.S.S. Builder Full Release 1.0.0. LAUNCH!
Hello! 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 sto
M.A.S.S. Builder Full Release Date Announcement
Hello 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
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-13.
| Genres | Action, Indie, RPG, Strategy |
| Player tags | Early Access · Action RPG · Mechs · Character Customization · Robots · Gun Customization · Indie · Hack and Slash · Sci-fi · Anime · Shooter · Action (SteamSpy community voting) |
| Features | Single-player · Multi-player · Co-op · Online Co-op · Full controller support · Steam Cloud · Family Sharing |
| Languages | English, Japanese, Simplified Chinese, Thai, Traditional Chinese |
| Controller | Full support |
| Official site | http://www.v-dgt.com/ |
Minimum system requirements (PC)
Minimum: Requires a 64-bit processor and operating system OS *: Windows 7, Windows 8.1, Windows 10 (64-bit versions only) Processor: Intel Core i5 or better / AMD Phenom II X3 or better Memory: 8 GB RAM Graphics: NVIDIA GeForce GTX 1050 or better / AMD Radeon RX 560 or better Storage: 3 GB available space Sound Card: DirectSound Compatible