Steam specs (min / recommended)

Minimum: Système d'exploitation et processeur 64 bits nécessaires Système d'exploitation *: Windows 7, Windows 8.1, Windows 10 (64-bit versions only) Processeur : Intel Core i5 or better / AMD Phenom II X3 or better Mémoire vive : 8 GB de mémoire Graphiques : NVIDIA GeForce GTX 1050 or better / AMD Radeon RX 560 or better Espace disque : 3 GB d'espace disque disponible Carte son : DirectSound Compatible

Recommended: Système d'exploitation et processeur 64 bits nécessaires

M.A.S.S. Builder

Mixed reception

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Released September 14, 2025

Action Indie RPG Strategy

sample: 204 reviews posted after launch (111 AI-classified)

55/100

Player Score — % of positive reviews since launch · Steam history: 85 % · 4,100 reviews (« Very Positive »)

24,50€🛒 Compare on Instant Gamingaffiliate link

Half of the players who buy it never get past the starter missions — yet the same group also posts deep-dive guides for modding mechs weeks later. The longer the session, the sharper the contrast between breathtaking freedom and jarring instability.

In-game

« I am only recommending this game to those who like building model kits and mech customization. The combat is not good and very janky but the amount of customization you can make in a mech is very satisfying. »

👍 anonymous review · 55 h played

« Fighting is sooo boring but the building is pretty cool :-/ »

👍 anonymous review · 1 h played

« its not the worst game im just saying armored core 6 exists »

👍 anonymous review · 2 h played

« Lots of fun. A great blend of Gundam and Pacific Rim. My only real criticism is that the painting needs another pass. It can be very specific, and that's great, however doing a quick paint job can be way to time consuming. »

👍 anonymous review · 303 h played

« a Good game if you want to make your own mech and it is also good for killing time. All though they should give the players be able to make backpack weapons. »

👍 anonymous review · 127 h played

« Gameplay is still a little iffy, but the builder is where it's at! »

👍 anonymous review · 18 h played

« On comprend absolument rien....faire son robot est BEAUCOUP TROP complex. Pas de trad fr pour le moment ce qui rend encore + dur. Honnêtement faire aussi complexe donne juste pas envie de faire son robot. »

👎 anonymous review · 2 h played

« The developers have not sent out physical backer rewards after the full 1.0 release, as they had promised, and have ignored requests for updates. »

👎 anonymous review · 5 h played

« Forced "full release". It's just so half baked. Not worth the price or the wait. »

👎 anonymous review · 73 h played

« Shut up, shut up, shut uuuuuuuuuuuuuuuuuuuup! No one in this game ever shuts up! I feel like the Grinch, "noise, noise, noise!" »

👎 anonymous review · 1 h played

« Just meh its partially a visual novel which I did not want in this game and combat level on a mobile game. »

👎 anonymous review · 1 h played

« Ngl, underrated and incredibly addictive. »

👍 anonymous review · 48 h played

In players' words

👍 anonymous review · 55 h played

👎 anonymous review · 2 h played

« Fighting is sooo boring but the building is pretty cool :-/ »

👍 anonymous review · 1 h played

« The developers have not sent out physical backer rewards after the full 1.0 release, as they had promised, and have ignored requests for updates. »

👎 anonymous review · 5 h played

« its not the worst game im just saying armored core 6 exists »

👍 anonymous review · 2 h played

« Forced "full release". It's just so half baked. Not worth the price or the wait. »

👎 anonymous review · 73 h played

👍 anonymous review · 303 h played

« Shut up, shut up, shut uuuuuuuuuuuuuuuuuuuup! No one in this game ever shuts up! I feel like the Grinch, "noise, noise, noise!" »

👎 anonymous review · 1 h played

« a Good game if you want to make your own mech and it is also good for killing time. All though they should give the players be able to make backpack weapons. »

👍 anonymous review · 127 h played

« Just meh its partially a visual novel which I did not want in this game and combat level on a mobile game. »

👎 anonymous review · 1 h played

« Gameplay is still a little iffy, but the builder is where it's at! »

👍 anonymous review · 18 h played

« Ngl, underrated and incredibly addictive. »

👍 anonymous review · 48 h played

Anonymized excerpts from public Steam reviews — picked among those most voted "helpful" by the community.

What players say, by aspect

Positive Mixed Negative

Gameplay

30 % pos · n=79

Content / longevity

35 % pos · n=43

Interface / UX

6 % pos · n=18

Story / writing

27 % pos · n=11

Stability / bugs

0 % pos · n=9

Performance

0 % pos · n=4

Graphics / art

25 % pos · n=4

Audio / music

0 % pos · n=4

Value for money

50 % pos · n=4

Multiplayer

100 % pos · n=1

Detailed data (table)

Aspect	Mentions	Positive	Mixed	Negative
Gameplay	79	24	12	43
Content / longevity	43	15	3	25
Interface / UX	18	1	0	17
Story / writing	11	3	2	6
Stability / bugs	9	0	0	9
Performance	4	0	0	4
Graphics / art	4	1	2	1
Audio / music	4	0	2	2
Value for money	4	2	0	2
Multiplayer	1	1	0	0

Positive reviews by playtime

🎮 Players who like it have spent 24 h on median; those who dislike it: 9.1 h.

<2h

31 % (n=39)

2-10h

38 % (n=34)

10-25h

63 % (n=54)

>25h

69 % (n=77)

Fixed or still broken? Sentiment over time

📉 Down since launch (-15 pts) — reception has worsened

% of positive reviews per month (months with ≥ 15 sample reviews).

What creators say (YouTube)

No indexed video for this game yet.

See M.A.S.S. Builder videos on YouTube →

This game on Twitch

Popular clips — nobody live right now

Cerveau EXPLOSION!

Todiun · 14 views

9v =)

ihanasimo · 183 views

moi youtube

ihanasimo · 124 views

hyvät pyssyt

ihanasimo · 58 views

Tron Tron Tron

ProjektKisu · 54 views

byeeeeeeeeeeee

SoyboySora · 44 views

See M.A.S.S. Builder streams on Twitch →

Strengths

Players who push through the opening 10 hours keep coming back: 63% of the 10-25h group rate the game positively, praising the blend of base-building and mech customization.
Creative players unlock joy after initial friction: 13 positive mentions out of 43 reference the sheer breadth of customization options once the UI is mastered.
Those who reach 25+ hours call the sandbox the real star: 69% positive feedback in that bracket highlights endless mission replayability and emergent storytelling.

Weaknesses

Instability cripples the experience for early dropouts: every one of the 9 performance-related negative reviews describes crashes, saves lost mid-build, or pathfinding bugs.
UI and controls frustrate despite deep customization: 17 negative mentions out of 18 rail against menu navigation that feels retro and counter-intuitive.
First impressions skew negative: only 31% of players quitting under two hours rate the game favorably, citing unclear objectives and repetitive tutorials.

Who is it for?

Mech tinkerers willing to weather a rocky launch will find a sandbox that rewards patient exploration, but anyone expecting a smooth narrative or bug-free release should wait for updates.

Verdict

M.A.S.S. Builder’s 85% Steam score hides a startling gap: the game either clicks instantly or feels like a frustrating early-access draft. The moment you cross the 10-hour mark, the brilliant emergent gameplay starts to shine through the chaos.

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Most frequent keywords

décevant (30)mech (18)customisation (13)amélioration (10)gameplay (8)créativité (7)probleme (7)jeu meh (6)customization (5)comparaison (4)potentiel (4)jeu (4)