M.A.S.S. Builder
Publisher: Sekai Project · Release date: 2025-09-15
Where is M.A.S.S. Builder cheapest in the US?
The cheapest M.A.S.S. Builder key that activates in the US has a listed price of $3.57 at K4G (Steam, GLOBAL key). That is 79% less than the dearest offer we track. That compares with $17.49 on Steam. Checked .
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.
M.A.S.S. Builder prices
Prices last checked . Each is the price the store lists; marketplaces add a service fee at checkout.
- K4G — $3.57 (Steam, GLOBAL)
- Eneba — $3.67 (Steam, GLOBAL)
- Kinguin — $3.68 (Steam, GLOBAL)
- Key4Games — $3.79 (Steam, GLOBAL)
- Instant Gaming — $3.89 (Steam, GLOBAL)
- HRK Game — $3.91 (Steam, GLOBAL)
- Eneba — $4.01 (Steam, EUROPE)
- GGsel — $4.08 (Steam, GLOBAL)
- Steam — $17.49 (Steam, GLOBAL)
- Driffle — €3.85 (Steam, GLOBAL)
- G2A — €31.65 (Steam, EUROPE)
Questions about M.A.S.S. Builder
Is a M.A.S.S. Builder key cheaper than buying it on Steam?
Yes. The cheapest key that activates in the US costs $3.57, 79% less than the $17.49 Steam asks.
What is the lowest M.A.S.S. Builder price in the last 30 days?
The lowest price we recorded for M.A.S.S. Builder in the last 30 days, counting keys for every region, was $3.57. The lowest listed price for a key that activates in the US is $3.57 today.
Do these M.A.S.S. Builder prices include fees?
Not always. Stores that sell their own keys, such as Steam and GOG, add no service fee, though sales tax is added at checkout in the US and Canada. Marketplaces add a service fee at checkout, and some payment methods add their own, so on a marketplace the total at checkout will be higher than the price listed here.
Will every M.A.S.S. Builder key work in the US?
Not all of them. Keys sold for another region (EUROPE) may not activate on an account registered in the US; that applies to 2 of the 11 offers here. The cheapest key named above does.
Is it safe to buy a cheap M.A.S.S. Builder key?
Official stores sell their own keys. Marketplaces and third-party sellers sell keys from other sellers: check the seller and the key’s region before you buy, and pay through the store’s own checkout.
M.A.S.S. Builder reviews
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Steam: Very Positive (85%) · 3,741 reviews