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M.A.S.S. Builder

As commander of a private military company, you pilot a Mechanical Assault Skeleton Suit (M.A.S.S.) in a war against the alien creatures known as Quarks. The campaign sends you into battle to help defend humanity. Fight groups of enemies and larger, more aggressive foes with ranged and melee weapons. Boost across battlefields to move and attack, and shape your approach with combat builds and upgrades. Customize your mech’s appearance with armor parts, paint, and accessories, while its looks are kept separate from stat-bearing equipment. Build weapons from component parts, then earn blueprints and resources in missions to unlock more parts and progress through upgrade trees.

Pilot a customizable M.A.S.S. against alien Quarks, building mech and weapon designs while fighting through action-RPG missions.

Released 14 Sep 2025

85%positive of
4.1k player reviews
$24.99
View on Steam
1

Build a Custom Mech

2

Design Your Weapons

3

Boost Through Alien Hordes

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.

Developed by Vermillion Digital · Published by Sekai Project

M.A.S.S. Builder screenshot 1M.A.S.S. Builder screenshot 2M.A.S.S. Builder screenshot 3M.A.S.S. Builder screenshot 4M.A.S.S. Builder screenshot 5M.A.S.S. Builder screenshot 6M.A.S.S. Builder screenshot 7M.A.S.S. Builder screenshot 8M.A.S.S. Builder screenshot 9

Common Player Critiques

  1. Repetitive Combat
  2. Part Unlock Grind
  3. Long Story Dialogues
  4. Clunky Aiming Controls
85%
positive of 4.1k player reviews

Awards & Kudos

M.A.S.S. Builder awardM.A.S.S. Builder award

Back of the Box

Platforms Windows
Age ratings
  • ClassInd (Brazil) 12 — Violência
  • IGRS (Indonesia) 15 — Kekerasan Interaksi Daring
  • Steam (Germany) 16 — Gewalt
Controller support Xbox
Controller required No
Demo View demo on Steam
DLC / extras 1 listed on Steam
Content notices
  • Online interactivity
Website Official website

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Is M.A.S.S. Builder free?▾
M.A.S.S. Builder is currently listed at $24.99. Get it on Steam here.
Who made M.A.S.S. Builder, and when did it come out?▾
It was developed by Vermillion Digital and published by Sekai Project, released on September 14, 2025.
What should I play if I like M.A.S.S. Builder?▾