M.A.S.S. Builder

About

“A future in where humans lived a prosperous century and technology advancing beyond space and time,” that was what humanity should have been if not for the sudden appearance of unknown beasts of the void. A large portion of humanity were gone in the moment.

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8
Based on
2182 reviews
Country Compatibility:
Languages:
Developer:
Vermillion Digital
Publisher:
Sekai Project
Engine:
Unreal Engine 4
Release date:
14 September 2025
Recent Steam reviews:
Not specified
All Steam reviews:
Very Positive (2182)

Game features

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Description

“A future in where humans lived a prosperous century and technology advancing beyond space and time,” that was what humanity should have been if not for the sudden appearance of unknown beasts of the void. A large portion of humanity were gone in the moment. War for the survival of humanity broke off all over the world, changing landscapes and settlements into warzones. Humanity were forced to relocate into shelters and reinvent their technologies into weapons of war, the M.A.S.S. technology.

M.A.S.S. Builder is an Action RPG with players piloting a M.A.S.S. (Mechanical Assault Skeleton Suit) as a commander of a private military company, setting out to help combat the threat of Quarks. You will build, customize, and fight to save the world, or at least, have fun creating and customizing your perfect mechanical suits.

The game features an in-depth customization system that has a clear distinction between equipment that gives status and equipment of pure aesthetics. You will be able to customize everything to suit your playstyle while looking good in this fast-paced mechanical combat.


Key Features

  • Customize your own M.A.S.S. without the worry of using cool looking armors with low stats, all parts don't have stats!
  • Fast paced movement through the battlefield with boosters for you to move around and attack through your enemies.
  • Fight against hordes of beastly aliens called Quarks, and giant ones that will aggressively hunt you down.
  • Pick how your weapon looks and shoots with hundreds of parts available to mix and match.
  • A world compelling and rich with information for you to immerse yourself in.

Recommended system requirements

minimum*

Requirement 1:
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

recommended*

Requirement 1:
Requires a 64-bit processor and operating system

User reviews

Impossible
Recommended | 23 Mar 2026
54.7h played

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.

Helpful: 26
levenoss
Not recommended | 27 Jan 2026
7.4h played

This game has been in development for about 7 years now and not only have they not added the 2 new frames I bought the game for like 5 years ago they really haven't added much at all. On top of this they just did a QA

Helpful: 28
RainingMezzer
Not recommended | 13 Apr 2026
11.2h played

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

Helpful: 12
TheOneTrueUncle
Recommended | 02 Apr 2026
153h 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

Helpful: 11
MeGaTRoN v87
Not recommended | 08 Feb 2026
4.9h played

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.

Helpful: 34
Yegmesh
Recommended | 09 Mar 2026
16h played

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

Helpful: 2