M.A.S.S. Builder — cheap CD keys, compare prices
Is it worth buying?
- Reviews are solid. (Steam 85%)
- The price is at or near its all-time low — a good time to buy.
Estimate based on public reviews (Metacritic/Steam) and price history — the final call is yours.
About the game
An action RPG where you customize and build your own Mechanical Assault Skeleton Suit and lead the fight against an alien invasion bent on wiping out humanity, with deep mech customization at its core.
Did you know?
The game was published by Sekai Project, a label well known for anime-styled and Japanese-inspired indie releases.
Best price today
€3.08
all-time low: official €17.15 · keyshop €2.99 near low
On Steam: €17.15 — you save 82% here
The cheapest M.A.S.S. Builder key right now costs €3.08 at Kinguin — the best of 7 compared offers. The lowest price we have recorded for this game: €2.99. The cheapest official store price is €17.15 at Steam.
The average low over the past 5 months was €3.22.
Prices as of
GameSeal Marketplace
Steam Official store
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
M.A.S.S. Builder prices by store 7
| Store | Type | Price |
|---|---|---|
| Kinguin | Marketplace | €3.08 |
| K4G | Marketplace | €3.15 |
| GameSeal | Marketplace | €3.17 |
| Driffle | Marketplace | €3.24 |
| Instant Gaming | Marketplace | €4.09 |
| G2A | Marketplace | €4.58 |
| Steam | Official store | €17.15 |
Lowest — official stores
€17.15
Jul 2026
Lowest — keyshops
€2.99
Sept 2026
Price history
last 89 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €17.15 | €3.08 |
| Sept 2026 | €24.50 | €2.99 |
| Aug 2026 | €17.15 | €3.20 |
| Jul 2026 | €17.15 | €3.34 |
| Jun 2026 | €17.15 | €3.48 |
Lowest in-stock price per month from our price history; the current month is the low so far.
How to activate your key
- Steam key — open the Steam client → Games → Activate a Product on Steam → enter the key. Stores with this activation: Kinguin, K4G, GameSeal, Driffle, Instant Gaming, G2A, Steam
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All-time low so far: €2.99
System requirements
| Minimum | |
|---|---|
| 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 RAM |
| Graphics | NVIDIA GeForce GTX 1050 or better / AMD Radeon RX 560 or better |
| Storage | 3 GB available space |
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About this game — FAQ
Does M.A.S.S. Builder have co-op?
Yes, M.A.S.S. Builder supports online co-op.
Does M.A.S.S. Builder have multiplayer?
Yes, M.A.S.S. Builder has multiplayer.
Can M.A.S.S. Builder be played single-player?
Yes, besides multiplayer modes, M.A.S.S. Builder can also be played solo (single-player).
Does M.A.S.S. Builder support a controller/gamepad?
Yes, M.A.S.S. Builder has full controller support.
What languages does M.A.S.S. Builder support?
M.A.S.S. Builder is available in: English, Japanese, Simplified Chinese, Thai, Traditional Chinese.
Does M.A.S.S. Builder use Steam Cloud saves?
Yes, M.A.S.S. Builder uses Steam Cloud, so your saves sync across devices.
FAQ
Where is the cheapest place to buy a M.A.S.S. Builder key?
The cheapest M.A.S.S. Builder key is currently sold by Kinguin for €3.08. That is the best of 7 offers we compare; prices are refreshed regularly. The lowest price we have ever recorded for this game: €2.99.
How much does M.A.S.S. Builder cost?
M.A.S.S. Builder currently costs from €3.08 — the cheapest offer across the stores we track. For comparison, the game costs €17.15 on Steam, so buying a key saves you about 82%.
Is Kinguin an official store or a keyshop?
Kinguin is a keyshop (marketplace) where independent sellers list keys, so prices are often lower than in official stores. Every offer on ulov.gg is clearly labeled with its store type.
Are keys from these stores legal?
Buying is legal — keys come from the grey market, so a small deactivation risk exists. So before paying, check the seller's buyer protection.
Which key region should I pick?
Global activates everywhere. Regional keys (Europe, North America, RU-CIS) only work on accounts from that region — use the Region filter to match your account.
What is an activation platform?
The service where the key activates — Steam, GOG, Epic or the publisher's platform. A key for one platform won't work on another, hence the separate filter.
What's the difference between editions?
Standard is the base game; Deluxe usually adds an expansion or bonus content. The edition filter shows exactly that variant, with no mixed prices.