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M.A.S.S. Builder Steam store
Game description
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.
Basic info
| Developer | Vermillion Digital |
|---|---|
| Publisher | Sekai Project |
| Platforms | Windows |
| Steam Deck | Playable! |
| Release date | Sep 14, 2025 |
| Price |
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Minimum specs
| 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 |
| Graphics | NVIDIA GeForce GTX 1050 or better / AMD Radeon RX 560 or better |
| Storage | 3 GB |
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Review Analysis Score
We haven't read this game's reviews yet. Scores will appear here once we have.
Not enough recent reviews for us to analyze this game yet. 26 Steam reviews in the last 90 days
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Steam review activity
since launch, by month · major update DLC
Sep 2019Nov 2026
per day · 9 reviews, peak 2/day
Oct 4Nov 2
per month · 26 reviews, peak 11/month
Aug 2026Oct 2026
per month · 68 reviews, peak 23/month
May 2026Oct 2026
per month · 137 reviews, peak 23/month
Nov 2025Oct 2026
Steam only gives daily counts for the last 30 days; longer ranges are by month. Months with fewer than 10 reviews are left out of % positive. "Show updates" marks major updates and DLC the developer posted on Steam (since about 2020) — hover a column to see % positive the month before and after.