Skip to content
keyfinder.
Your game. Your choice of store.
Review us onTrustpilot

M.A.S.S. Builder

MechsAction RPGCharacter CustomizationRobotsGun Customization85% positive on Steam
Vermillion DigitalReleased 15 Sept 2025
13 active offers across 8 stores

All offers (13)

Compare the platform, region and delivery before you buy.

Delivery

Standard Edition 13 offers · EU & Global

  • M.A.S.S. Builder PC Steam CD KeyActivation key
    SteamGlobal
    Lowest price€3.17+ payment fee
    View deal
  • M.A.S.S. Builder PC Steam CD Key (valid until May 2027)Activation key
    SteamGlobal
    €3.22+ payment fee
    View deal
  • M.A.S.S. Builder (Global) (PC) - Steam - Digital KeyActivation key
    SteamGlobal
    €3.24no Plus, no Protect
    View deal
  • M.A.S.S. Builder (PC) Steam Key - GLOBALActivation key
    SteamGlobal
    €3.27+ service fee
    View deal
  • M.A.S.S. Builder Steam Key GLOBALActivation key
    SteamGlobal
    €3.29+ fee possible
    View deal
  • M.A.S.S. Builder EN GlobalActivation key
    SteamGlobal
    €3.29+ service fee
    View deal
  • M.A.S.S. Builder PCActivation key
    SteamGlobal
    €3.59
    View deal
  • M.A.S.S. Builder (PC) Steam Key EUROPEActivation key
    SteamEurope
    €3.60+ fee possible
    View deal

Official store Steam · price for Germany

  • Steam store pageDirect purchase
    SteamGermany
    €24.50No fee
    View on Steam

You buy directly from the store. "+ service fee" or "+ payment fee" means the store adds a fee at checkout; you see the final price there before you pay. We may earn a commission when you buy through our links.

Best price over the last 32 days

€30.00€20.00€10.00€0.0011 Oct 202611 Nov 2026
  • Lowest €2.995 Nov 2026
  • Highest €3.179 Nov 2026
  • Today €3.17

The cheapest EU or Global key per day across all compared stores; the dashed line is the Steam price.

M.A.S.S. Builder screenshot 1M.A.S.S. Builder screenshot 2M.A.S.S. Builder screenshot 3M.A.S.S. Builder screenshot 4

Buy M.A.S.S. Builder key: current price comparison

Where is the M.A.S.S. Builder key cheapest?

The cheapest M.A.S.S. Builder key that activates in the EU currently costs €3.17 at Kinguin. Keyfinder compares 13 offers from 8 shops for this price. That is 87% less than the Steam price of €24.50. Prices are refreshed hourly; region, edition and any checkout fees are shown on each offer.

What was the lowest M.A.S.S. Builder key price in the last 32 days?

€2.99 on 5 Nov 2026, for the standard edition that activates in the EU. The highest daily low in that time was €3.17 on 9 Nov 2026; today the cheapest key costs €3.17.

Which M.A.S.S. Builder keys activate in the EU?

13 offers are marked EU or Global and activate in Germany and the rest of the EU. Keys for other regions are listed separately. The keys on offer are for Steam.

What a game key is and how to read an offer

How do I activate the M.A.S.S. Builder key?

The cheapest key activates on Steam. You redeem it there with the code the shop sends you after you pay.

How to redeem a Steam key

Is it safe to buy a M.A.S.S. Builder key from Kinguin?

Before you pay, check three things on the offer: the region (EU or Global for Germany), the edition and any fee added at checkout. Keyfinder shows all three on every offer. Our Kinguin check covers who runs the shop, its fees and its regions.

Is Kinguin legit? Read our check

Games like M.A.S.S. Builder

Games in similar genres.

About M.A.S.S. Builder

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.

Developer
Vermillion Digital
Publisher
Sekai Project
Release date
15 Sept 2025
Steam
View on Steam