
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
i like this concept of this game . i hope you put more update soon
很好
If you want to use a large library of existing parts to create an endless amount of mecha, this is the game for you. The tuning and combat systems are grindy, but once you take the time to unlock stuff it's worth it. Combat is a bit samey a lot of the time, but different weapon styles help change it up enough to make it fun.
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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
There's far too little content to justify the $24.99 price tag as of right now. This game is great, don't get me wrong, but for the love of GOD please add more content, devs! I really wanna like this game, but man... Sekai is being lazy af
fun to build cool units, not fun to grind missions to unlock new parts. As of now the actual combat gameplay is quite lacklustre.
Locura de personalizacion!!!
自由度很高,可以手搓高达
Never seen mech customisation even remotely comparable. You can customise everything, from the length of your mechs internal 'bones', to the abilities and outputs of all the various parts. And that comes in handy as you build mechs able to handle the enemies various strengths and weaknesses. The combat is fast and snappy once you get used to it. and enemy variety improves as you get further in. My only real issue is aesthetic. I very much dislike the anime girls popping up on the screen and hope there's an option to disable them in future, as they are jarring and don't match the aesthetic of the rest of the game at all, but that's just me.
I've played through all the story stuff so far. I can't wait for the full game to release because I've gotten through it all. I'm still trying to figure out the design stuff, but I've been able to get all the parts you'd use or basic design. Combat is fun but can be frustrating. The retry system is a bit annoying if you die too much. I recommend it as a mech-building game. If I can update this after the full game comes out, I will update it!
customization, good. English translation, bad. Gameplay is nothing too impressive. Though I think gameplay was always a second thought. This is M.A.S.S (Builder), not a full game. I do enjoy what they have implemented though, even if its quite generic. Its Crossout, with mechs and far less gameplay with most of the budget going to the customization. And the customization aspects are insanely detailed.
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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