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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.
Price history tracked since Jul 7, 2026 · vs all tracked offers.
Based solely on tracked price history — not purchase advice.
How it worksTracked since Jul 7, 2026.
Steam Train Fest ends
Official stores with direct support.
Third-party resellers. Often cheaper, without official store support. Keyshop prices vs Steam →
Try this game before buying.
Lowest tracked price: PLN 13.59 (Jul 22, 2026) · current best: PLN 13.59 across 6 stores.
36% positive reviews in the last 30 days (85% all-time) · 24 peak players in the last 30 days.
Right now the cheapest offer for M.A.S.S. Builder is PLN 13.59 at Eneba. KingsPrice compares 7 offers from 6 stores — official stores and keyshops — and refreshes prices throughout the day.
The lowest price KingsPrice has tracked for M.A.S.S. Builder is PLN 13.59 (recorded on Jul 22, 2026). This covers the stores and period we monitor — set a price alert to catch the next drop to that level.
M.A.S.S. Builder peaked at 24 concurrent players on Steam in the last 30 days (highest on Jul 8, 2026). The player chart on this page updates daily.
Keyshops are marketplaces that resell game keys, usually below official store prices. The keyshops listed on KingsPrice deliver genuine Steam keys, but buyer protection differs from official stores — check the shop's rating and refund policy before buying. You can hide keyshop offers at any time with the keyshops toggle. Keyshop prices vs Steam →
Create a free price alert on this page and KingsPrice will email you when M.A.S.S. Builder drops below your chosen price. The biggest discounts usually appear during seasonal Steam sales and publisher promotions — the sale calendar on this page shows the next confirmed event.
