Opus Magnum

Opus Magnum

Zachtronics · 2017 · Puzzle, Programming, Automation, Indie, Simulation

PC
Overwhelmingly Positive97% · 5,81390Metacritic192playing now
Best price 48 Good deal
$9.99-50%
$19.99lowest tracked $6.79
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Standard Edition · Steam
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GOG
Standard Edition · DRM-Free
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Humble Store
Standard Edition · Steam
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About Opus Magnum

✦ AI summary

Build elaborate alchemical machines using programmable arms, tracks, and mystical components to transmute elements and solve open-ended puzzles in this physics-based engineering game from Zachtronics. Compete globally to find the simplest, fastest, and most compact solutions, create custom puzzles for Steam Workshop, and uncover dark conspiracies within a rich narrative of ancient Houses and dangerous alchemists.

“It is not an exaggeration to say that without alchemical engineering, civilization would not exist.”

Hailed as the most promising alchemist of his generation, Anataeus Vaya has just accepted a position as Head Alchemist of House Van Tassen, the oldest and richest of the city’s ancient Houses. But dangers lurk behind the family’s opulent facade, and alchemy alone may not solve every problem.

Opus Magnum is the latest open-ended puzzle game from Zachtronics, the creators of SpaceChem, Infinifactory, TIS-100, and SHENZHEN I/O. Master the intricate, physical machinery of the transmutation engine— the alchemical engineer’s most advanced tool— and use it to create vital remedies, precious gemstones, deadly weapons, and more.

Design Machines - Design and build machines that carry out alchemical processes using a variety of components including programmable arms, customizable tracks, and more esoteric devices like Van Berlo’s wheel and the Glyph of Animismus.

Open-Ended Puzzles - Compete against your friends and the world to build the simplest, fastest, and most compact solutions to the game’s challenges. Export animated GIFs of your elegant designs to show them off.

Steam Workshop - Make and share your own puzzles with full Steam Workshop integration and an easy-to-use puzzle editor. Play the top user-submitted puzzles in the prestigious Journal of Alchemical Engineering, curated by Zachtronics!

Rich Story - Intrigues and dark plots swirl around the city’s ancient Houses. Alchemists, who hold the power to create almost anything known to science, are highly sought— and highly dangerous.

Solitaire Minigame - Alchemical engineering takes focus and concentration. Take a break with Sigmar’s Garden, an original alchemy-based solitaire game. Every game is winnable, but not every game will be won…

DLC & expansions

🎁 Complete the collection

Base game + 1 of 1 DLC at today's best prices.

$22.98
to own everything

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

Recommended Jul 17, 2026
This game is my new favorite puzzle game 10/10
Recommended Jul 16, 2026
really fun open ended puzzle game. I appreciate how accessible they make the programing aspect, essentially using symbols and a timeline makes it seem really easy to build a solution and by the time you are done you realize you have built something fairly complex and it feels great. I never felt like the game was too hard or cheating me in any way the biggest opponent was usually myself trying to make something work that was doomed from the start.
Recommended Jul 16, 2026
Sigmar has me in his clutches
Recommended Jul 16, 2026
This is an excellent puzzle game, challenging enough to make you feel smart for solving its puzzles but not so challenging as to feel overly frustrating. Its story is interesting, too, and helps give context and meaning to each of the puzzles you're tasked with solving. Replay value can be found in optimizing your puzzle solutions and in the solitaire minigame Sigmar's Garden, a simple yet fun matching game that ties in well with the main game. The DLC is as interesting as the main story and different enough in terms of its puzzles that you may want to work your way through both at the same time, at least once you've progressed enough in the main story to feel comfortable with how the game works.
Recommended Jul 16, 2026
good game but my head explodes at production alchemy
Recommended Jul 15, 2026
This is a challenging puzzle game where you use various bits of machinery to bond elements together into a desired configuration and automate the production. You select various arms wheels, and devices and give them a series of instructions to produce the desired results when you start the machine and let it run. The challenge is in syncing everything up and putting everything together without the bits colliding into each other as the machine cycles, and doing it in an as inexpensive and efficient way as possible. It can take a good while to solve each puzzle, setting up each segment of the solution, running through it, making corrections through trial and error. The programming could have been implemented a little better, as there's no way to step backwards through the instructions, and they could have made it easier to stay organized, given the ability to group instructions or turn sections on and off, etc., but it's still a good game and worth the time if this is the sort of puzzle you like.

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