Opus Magnum — cheap CD keys, compare prices
Is it worth buying?
- Reviews are excellent. (Metacritic 90 · Steam 97%)
- The price is above its low (was €7.12), but within a reasonable range. Notify me on a drop →
Estimate based on public reviews (Metacritic/Steam) and price history — the final call is yours.
About the game
Opus Magnum is an open-ended puzzle game where you design and build machines that produce potions, poisons, and other substances using an alchemical transmutation engine. Every puzzle has countless valid solutions, and the game scores you on efficiency, speed, and size of your build. It comes from studio Zachtronics.
Did you know?
Zachtronics, the studio of Zach Barth, is known for its series of programming and engineering puzzle games including SpaceChem, Infinifactory, and SHENZHEN I/O.
Best price today
€9.99
all-time low: official €7.12 · keyshop €9.99 (+40%)
On Steam: €14.25 — you save 30% here
The cheapest Opus Magnum key right now costs €9.99 at Instant Gaming — the best of 12 compared offers. The lowest price we have recorded for this game: €7.12. The cheapest official store price is €14.25 at Steam.
The average low over the past 5 months was €11.83.
↳ chosen by the region label on the key — not a guarantee
Prices as of
Steam Official store
Driffle Marketplace
Gog Official store
Gamivo Marketplace
Fanatical Official store
G2A Marketplace
No offers match these filters — try widening them.
Listed seller price shown — payment fees may vary by method.
There are also offers of another kind (Gift) — show (2)
These are not ordinary keys. A gift is usually region-locked and arrives through someone else's account — if the region does not match, the game will not activate. An account means you get someone else's login: the game never becomes yours, and it breaks Steam's rules. A DLC or a bundle is not the base game. That is why none of them count towards the price at the top of the page.
Opus Magnum prices by store 9
| Store | Type | Price |
|---|---|---|
| Instant Gaming | Marketplace | €9.99 |
| Kinguin | Marketplace | €11.99 |
| Driffle | Marketplace | €12.15 |
| Gamivo | Marketplace | €12.51 |
| K4G | Marketplace | €13.59 |
| Steam | Official store | €14.25 |
| G2A | Marketplace | €15.52 |
| Gog | Official store | €17.84 |
| Fanatical | Official store | €19.99 |
Lowest — official stores
€7.12
Oct 2026
Lowest — keyshops
€9.99
Oct 2026
Price history
last 89 daysMonthly price lows
| Month | Lowest official | Lowest keyshop |
|---|---|---|
| Oct 2026 | €7.12 | €9.99 |
| Sept 2026 | €9.75 | €11.02 |
| Aug 2026 | €17.09 | €15.59 |
| Jul 2026 | €17.42 | €11.23 |
| Jun 2026 | €19.50 | €15.45 |
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: Instant Gaming, Kinguin, Driffle, Gamivo, K4G, Steam, G2A, Fanatical
- GOG key — on GOG.com → Redeem a code (or in GOG Galaxy: Add games & friends → Redeem GOG code). Stores with this activation: Gog
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All-time low so far: €7.12
System requirements
| Minimum | Recommended | |
|---|---|---|
| OS | Windows Vista / 7 / 8 / 10 | Windows Vista / 7 / 8 / 10 |
| Processor | 2.0 GHz | 2.0 GHz |
| Memory | 4 GB RAM | 4 GB RAM |
| Graphics | 1366 x 768 | 1920 x 1080 |
| DirectX | Version 11 | Version 11 |
| Storage | 600 MB available space | 600 MB available space |
Similar games
Video reviews
19:08 Opus Magnum Review
Matthewmatosis
3:03 Opus Magnum Review
IGN
15:03 Programming Extremely Satisfying Alchemy Machines! - Opus Magnum
Aliensrock
Reviews are made and published by independent YouTube channels; they load only on click.
About this game — FAQ
Can Opus Magnum be played single-player?
Yes, Opus Magnum is a single-player game.
What languages does Opus Magnum support?
Opus Magnum is available in: English, French, German, Japanese, Russian, Simplified Chinese, Spanish - Latin America, Korean and 5 more.
Does Opus Magnum use Steam Cloud saves?
Yes, Opus Magnum uses Steam Cloud, so your saves sync across devices.
FAQ
Where is the cheapest place to buy a Opus Magnum key?
The cheapest Opus Magnum key is currently sold by Instant Gaming for €9.99. That is the best of 12 offers we compare; prices are refreshed regularly. The lowest price we have ever recorded for this game: €7.12.
How much does Opus Magnum cost?
Opus Magnum currently costs from €9.99 — the cheapest offer across the stores we track. For comparison, the game costs €14.25 on Steam, so buying a key saves you about 30%.
Is Instant Gaming an official store or a keyshop?
Instant Gaming 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.