M.A.S.S. Builder: Steam price vs key
M.A.S.S. Builder costs €5.35 as a key at BuyCheapKeys, versus a regular price of €24.50 on the Steam Store: you save €19.15 (78% less). The key activates on your Steam account and it's exactly the same game (prices from October 3, 2026).
- Instant deliveryKey by email and in your account
- Full guaranteeReplacement or refund
- Secure paymentCard, PayPal, Google Pay, Apple Pay
- Activates on SteamSame game in your library
- Up to 4% cashbackWith the VIP Club
Should I buy M.A.S.S. Builder now? A steal: buy it now
The key costs €19.15 less than the regular Steam price and is at its lowest recorded price. With 85% positive reviews, it's a safe buy.
Price score: 10/10 · The key is 78% below the regular Steam price.
The same game, for less
A Steam key gives you exactly the same as buying on Steam. Only the price changes.
Available M.A.S.S. Builder keys
1 offer, sorted by price
- €5.35Buy
M.A.S.S. Builder
CheapestSteam keyGlobal-€19.15 compared with the Steam regular price
M.A.S.S. Builder price history
- Steam regular price€24.50
- BuyCheapKeys key€5.35
We've been tracking this game since October 3, 2026. The chart will appear once there are a few days of data.
How to activate the M.A.S.S. Builder key
- 1
Buy the key
Choose the M.A.S.S. Builder offer and pay. You get the key instantly.
- 2
Open Steam
Go to “Games” › “Activate a Product on Steam”.
- 3
Redeem and play
Paste the key and the game stays in your library forever.
M.A.S.S. Builder FAQ
›How much is M.A.S.S. Builder on Steam?
The regular Steam price of M.A.S.S. Builder is €24.50. At BuyCheapKeys the Steam key costs €5.35, €19.15 less.
›Where to buy M.A.S.S. Builder cheapest?
The cheapest option is the BuyCheapKeys Steam key for €5.35, 78% below the regular Steam price. Instant delivery and it activates on Steam.
›Is the M.A.S.S. Builder key the same game as on Steam?
Yes. When you redeem the key, M.A.S.S. Builder is added to your Steam account with achievements, cloud saves and updates, just as if you bought it on Steam.
›What is the lowest price for M.A.S.S. Builder at BuyCheapKeys?
The lowest recorded price for the key at BuyCheapKeys is €5.35 (October 3, 2026). Today it costs €5.35.
›Will the M.A.S.S. Builder key work in my country?
We list Global and Europe region keys. Each BuyCheapKeys product page tells you whether it can be activated in your country before you buy.
›Is it safe to buy from BuyCheapKeys?
Yes. Delivery is instant by email and in your account, we accept card, PayPal, Google Pay and Apple Pay, and every purchase is covered by a replacement or refund guarantee.
›Does M.A.S.S. Builder work on Steam Deck?
Valve rates it “Playable” on Steam Deck. Once the key is activated on Steam you can play it on Steam Deck just like on PC.
›Is M.A.S.S. Builder worth it?
It has 85% positive reviews out of 3,732 on Steam (“Very Positive”), was released in 2025 and is developed by Vermillion Digital. Genres: Mechs, Action RPG, Character Customization, Robots.
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M.A.S.S. Builder
€5.35