
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.
Modeled estimate, not a reported figure. How we estimate →
Prices
Each in the currency that store quoted — not converted: the gap between two rows is the publisher's pricing, not an exchange rate.
Every market we collect.
Discounts
Every price cut of more than 20% we have observed, in each market that quoted one, with this game's chart position on either side of it. These are episodes, not a model: a sale is one event, and one event cannot tell you what the next one will do.
Reviews, worldwide (the counter carries no country): 0.14/day in the week to Aug 17 → 0.43/day in the week after.
About

Genres
Add-ons
Each DLC is estimated with the same model as a game, then summed — a modeled figure, not reported DLC sales.
Updates
Build ids and update times come straight from Steam's PICS — the same source SteamDB reads. Patch history grows as we record new builds.
Engagement
Reviews
Themes across 804 recent reviews and how positive each mention is. A keyword signal, not full sentiment analysis.
Reviews
Best Gundam game ever!!! M.A.S.S builder is the Gundam, more Gundam than satellite bandai
An amazing customization and skill based combat game. It has it all, it has very intuitive fps mechanics, incredibly simple combat mechanics that will get you through the game but doesn't limit you, you can grow in skill with all of the different types of weapons which brings me to the customization. There will NEVER be two mechs that are alike unless it was coordinated! There is no limit to the customization.
Media

Related
Related
Price dynamics, follower growth, revenue and sales trajectories with interactive tooltips
This and every other Pro feature is free until October 20, 2026. A free account is all it takes.
For scale, across Steam · Top Sellers · Brazil over the last 30 days: the 22 chart moves that followed a price cut of more than 20% went a median of 9 places towards #1, and the 2,513 moves with no price cut behind them went 2 away. One store, one chart, one country — it is the only place we have enough observations to say even that.
Prices outside the United States have been collected since 6 August 2026 and chart positions since 19 July 2026, so a cut older than that has no market to compare and a market that joined later has no history yet. Nothing here is converted between currencies.
Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English, Japanese, Simplified Chinese, Thai, Traditional Chinese
Hours played at review time, across 806 reviews with recorded playtime.
positive critical· bar length = how often the theme comes up
i like it
neat game, neat customization, though lack of weapon variety and weapon sound physic effect
This game is alright customization is good gameplay is horrible
SO GOOD
lo unico malo es que el multijugador esta muerto y es una pena el juego tiene potencial
This will be my first review I've put on steam, so if it seems a bit odd I apologize. Please note, this review was made around the release of 0.11 I want to say this first off, I enjoy creativity in games when it comes to "character creation" and seeing it moving and acting. M.A.S.S. Builder scratched an itch pretty well for that while giving me that rewarding feeling of me having to actually MAKE the design myself with the main body parts acting as good foundations for the designs. One particular complaint on the creation side might be the lack of leg types or the lack of ability to create your own leg types, as I'm used to mech games allowing you to have things like reverse joint legs, quad legs, and other types you might see in other mech games. (Perhaps I've been spoiled by games such as Chromehounds, Armored Core, Mechassault and similar.) However despite the quite honestly simplistic complaint I might have on leg selection or similar, I usually can simply build my way around it, or make something close enough to fit the design I have in mind. I can spend hours or even days just hopping on, building, hopping off, returning, redesigning and refining until I find it perfect. The mirror mode is a wonderful system on there and the quick manipulation of parts by rotation by axis to get it closer to what you want or similar is genuinely extremely helpful too. The core modification system for changing your mech's stats, functions, elemental benefits, special traits, flight speed, and so on is also quite honestly amazing. It's more in depth than a lot of mech games I have personally bumped into and it's refreshing as far as mech games go. Atop this, changing the mech's appearance, and making those stats make sense in terms of design choices is up to me rather than the armor parts. So I tend to get all the form and function at the same time. When it comes to the mech's movement, things feel very... stiff, it's not horribly so, but for a mech that is running doing spins and jumps and other little flares of movement with the melee attacks, the main movement feels like it could be better. But again, I don't consider it horrible either. Onto combat, the combat itself "Exists". It's not particularly amazing or particularly horrible. It's somewhat difficult for me to exactly describe it, it feels like there is enough going on to keep me from falling asleep and new encounters with certain bosses leave me needing to actually being alert. But for the most part I will often find myself sort of having to turn on high energy music in the background to help push for certain encounters so i don't just get bored as it sort of is "dull" at times. I don't believe this game needs to try and be the best in combat there ever was kind of ideal. But maybe the types of enemies could receive a light touch up to improve how they handle combat movement of enemies and your M.A.S.S., and maybe a better touch up on the soundtrack later. Lastly, the amount of multiplayer levels is very small, as multiplayer is separated entirely from the main campaign. It would be nice to have a multiplayer exclusive campaign that was it's own story or perhaps a progressive set of arenas with unlockable rewards on the side rather than effectively two or three arenas. However looking at the game as it is now, and the amount of work still very likely to go, I would rather feel it's a wiser choice for me not to worry and simply leave multiplayer alone for a long while until the single player and all the other functions of the game are improved to a substantial enough degree where the game feels close enough to "Whole" by the dev's standards. I understand fully that this is early access, the game is incomplete. I rather give more or less critique where I can fairly in my review. With all the customization and modifications that you can make to your mech. I can see where the game really shines, in it's building and modification systems for the mechs including the stats, perks, armor, and so on. It's understandable where other things might suffer in detail or quality in the process in order to focus on others. I understand also that the coding of games is like a minefield, one fix or change can create a whole host of other issues. So it makes sense a game like this has taken so long to work on. Especially since it came out in 2019 which 2019 and 2020 were certainly harsh years for everyone. I honestly am eager to see where this game goes and how it improves. And honestly, this game while not perfect, is quite impressive for what it is. Thank you all at Vermillion Digital for working on this and I hope to see what new things come to be in M.A.S.S. Builder.
Melee feels like ♥♥♥♥
Better than New Gundam Breakers by far
Players by region
Where this game's players are, estimated from review languages.
Players also reviewed
The games this title's players most often review too — audience affinity.
Related
| Game | Estimated lifetime revenue | Reviews | Review score | Price |
|---|---|---|---|---|
| $3M | 4.5K | 94% | $19.99 | |
| $3M | 4.7K | 87% | $29.99 | |
| $3M | 5.2K | 86% | $17.99 | |
| $3M | 3.9K | 67% | $39.99 | |
| $3M | 4.9K | 78% | $39.99 | |
| $3M | 5.6K | 82% | $14.99 |
Related
| Game | Estimated lifetime revenue | Reviews | Review score | Price |
|---|---|---|---|---|
| $8.1M | 6.2K | 85% | $49.99 | |
| $408 | 2 | 0% | $7.99 | |
| $2.4M | 6.1K | 63% | $21.24 | |
| $541.5K | 943 | 92% | $14.99 | |
| $44.4K | 122 | 51% | $14.99 | |
| — | 0 | — | — |