
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
Great indie Mech game
Very nice
Love it.
Media

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Price dynamics, follower growth, revenue and sales trajectories with interactive tooltips
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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
The best indie mecha builder ever
好游戏,好游戏,期待继续更新
It's okay
●良い所 本当の意味で自由にロボットが作成できる ●悪い所 パーツ集めが七面倒
but needs a better customize hud. hard to go through an nav almost seems to much when comes to armor an what parts go where and make your mech look how you want
先说优点,这游戏或是许市面上机甲创造自由度最高的游戏,但是也就仅此而已了。糟糕的战斗手感,血厚的小怪和boss,只汉化了一点点的中文,这些都让我无法给出好评,如果只是单纯为了捏机甲而来的可以入手,前提是你能忍受无聊的任务模式。
Got gifted this game for my birthday is coming up in the next 2 weeks more or less. Overall this game is really good and in my opinion is better than any other mech game I played, other than the likes of Armored Core 6 of course. Throughout my time playing I have overall gathered that Mass Builder is what Mecha Games should strive to be, should have wide customization, engaging missions, and overall developments trees in based as this game provides. Of course I have yet to truly gather a lot more experience but overall, 8/10 at best. This is only because the only drawback I noticed is how boring it can get at times and or brain numbing although I did say the missions are engaging they can only be engaging for so long until the gameplay loop gets stale. Of course! this is made up with the story and the visuals. Now I don't wanna Ramble too long and of course I don't think anyone will read this really soooooo... Yeah, good game- A Tier honestly
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.
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