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Opus Magnum
Opus Magnum is the latest open-ended puzzle game from Zachtronics, the creators of SpaceChem, Infinifactory, and SHENZHEN I/O. Design and build machines that assemble potions, poisons, and more using the alchemical engineer’s most advanced tool: the transmutation engine!
What players say
Steam review score and the most-helpful voices, which may include critical ones. Score via Steam as of 2026-09-02 · quoted reviews as of 2026-05-12.
What reviewers agree on
80 of the 102 reviews raise this.
“Zach Barth said "Zachtronics is over" 3 years ago. I accepted it. I moved on. Then out of the blue Z changes his mind and drops 17 new puzzles on us like the USA bombs countries these days. No warning. No apology. This…”
“If you like Factorio, shapez, or Satisfactory, you'll get a kick out of this. You COULD brute-force every solution, but it is so satisfying to make your solutions as efficient as possible.”
“This game has a solid foundation, the core mechanic is easy but it has the perfect learning curve. Im halfway through the campaign and I am having a blast.”
17 of the 102 reviews raise this.
“This game has a solid foundation, the core mechanic is easy but it has the perfect learning curve. Im halfway through the campaign and I am having a blast.”
“Alchemical game about being an alchemist and feeling like a genius every time you optimize your work. It actually also has a very solid story and good music. Starts chill but get very hard/rewarding towards the end.”
“An intricate Puzzle-Game perfect for anyone who claims to have good spatial thinking - at times very challenging without being unfair, rewards creative solutions”
10 of the 102 reviews raise this.
“Alchemical game about being an alchemist and feeling like a genius every time you optimize your work. It actually also has a very solid story and good music. Starts chill but get very hard/rewarding towards the end.”
“Automation puzzle solver. Story is light but it suprisingly captured my interest. 5/5 game.”
“My personal favorite of the Zachtronics catalog. I really love the cutthroat aristocratic world they've built.”
7 of the 102 reviews raise this.
“most beautiful zach-like. most accessible zachtronics game also. i revisited several and only had enthusiasm for this and certain games in Last Call BBS. the beauty really matters, man. a lot of zach-likes look like a…”
“A fantastic and beautifully designed puzzle game”
“Wonderful game. Nice aesthetics.”
6 of the 102 reviews raise this.
“One of the best puzzle games I've ever played. I still can't believe they put out a DLC 8 years later and its just as good as the base game. Lots of player made puzzles in the workshop too.”
“This is probably the best Zachtronics game, get DLC also, it is much fun!”
“Very fun automated game, I hope the production team can produce more high-quality dlc.”
4 of the 102 reviews raise this · 4 of them still recommend the game.
“Possibly peak Zachtronics. And like all the rest of their games, one that I'm unable to finish. But that doesn't stop me from enjoying the 50-70% of the game that I can play before my brain melts.”
“So here's my situation: I ADORE SpaceChem. It's one of the oldest games in my library, and I go back to play it regularly. But I usually only ever get past the first couple chapters. Not because of the complexity, but…”
“The game is well done for what it is. It's interesting and kind of fun at beginning, but as you progress and "difficulty" increases it becomes tedious, the more complex levels feel like a chore.”
3 of the 102 reviews raise this · 1 of them still recommend the game.
Counted across 102 English reviews, sampled to match this game's 97.3% positive rating · as of 2026-05-12
“I am not a computer programmer and I don't enjoy math. I have a degree in English Literature, which doesn't make me the obvious target audience for a game like this. And yet somehow even I got addicted to Opus Magnum. I enjoy the game is because the puzzles have open-ended…”
— a player, Steam review · 45 hrs played“One of the best games I've ever played. I spent countless hours optimizing and enjoyed every aspect of this game.”
— a player, Steam review · 1,430 hrs played“Saw it on a youtube video (GoodbyeGalaxy on yt) and thought "man that seems like a game i would like" and booooyyyy was i right. I have 13.4 hours as of rn and i love it so much. Genuinely a genius concept of a game. If you like Satisfactory, techtonica, factorio, or any other…”
— a player, Steam review · 34 hrs playedPlayer activity
Monthly average concurrent players. Live data self-collected from the Steam API · history through 2026-06 via SteamCharts.
Achievement stats
Global completion rates across all Steam players — a data view of how far people actually get. Source: Steam official stats · as of 2026-09-05.
Price tracking
US-region pricing (USD), sampled twice daily by our own tracker since 2026-07-11. Steam prices vary by region — always confirm your local price on Steam.
Regional prices at last sample, in local currency — Steam sets each region's price independently.
Cheapest → most expensive, converted to USD at ECB reference rates (2026-09-10). Relative comparison only.
Latest official news
Developer announcements via the Steam news API — links go to the original posts. More across all games on the news hub.
UPDATE: Small bug fixes
This update fixes a few small bugs: Fixed a bug in today's earlier update where the folder picker dialog on Windows was stuck behind the game window (I have three monitors and did not notice, sorry no
UPDATE: In-game option for setting the GIF output directory
Today's update adds an in-game option for setting the GIF output directory. Clicking the "SET" button should open an OS-level folder picker dialog, which seems like exactly the kind of thing that won'
UPDATE: Russian journal translation
Today's update adds a Russian translation for the Journal of Alchemical Engineering, contributed by TrottingHeart from the unofficial Zachtronics Discord.
UPDATE: Korean DLC translation
Today's update actually contains a Korean translation of the De Re Metallica DLC, unlike last week's update that only translated the puzzle names and the Journal of Alchemical Engineering. Thanks agai
UPDATE: Korean DLC and journal translation
Today's update adds a Korean translation for the De Re Metallica DLC campaign and the Journal of Alchemical Engineering, contributed by Haxton from the unofficial Zachtronics Discord. It also contains
Games like Opus Magnum
From our knowledge graph — ranked by shared traits, not a black box. Each card says why it's here.
SHENZHEN I/O
94.5% · 2,778 reviews
shares Programming, Automation, Building, Logic
SpaceChem
93.4% · 3,411 reviews
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Human Resource Machine
91.9% · 2,363 reviews
shares Programming, Automation, Logic, Great Soundtrack
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95.0% · 1,976 reviews
shares Programming, Automation, Building, Logic
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93.0% · 975 reviews
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The Howler
73.3% · 688 reviews
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Screenshots
Official Steam store screenshots — click any shot to enlarge.
Facts & details
From the Steam store record, snapshot 2026-05-12.
| Genres | Indie, Simulation |
| Player tags | Puzzle · Programming · Automation · Indie · Simulation · Logic · Singleplayer · Great Soundtrack · Steampunk · Building · Difficult · Sandbox (SteamSpy community voting) |
| Features | Single-player · Steam Achievements · Steam Workshop · Steam Cloud · Steam Leaderboards · Includes level editor · Family Sharing |
| Languages | English, French, German, Japanese, Russian, Simplified Chinese, Spanish - Latin America, Korean, Turkish, Ukrainian, Portuguese - Portugal, Czech, Polish |
| Achievements | 5 |
| Official site | http://www.zachtronics.com/opus-magnum |
Minimum system requirements (PC)
Minimum: Requires a 64-bit processor and operating system OS *: Windows Vista / 7 / 8 / 10 Processor: 2.0 GHz Memory: 4 GB RAM Graphics: 1366 x 768 DirectX: Version 11 Storage: 600 MB available space