Buy Parallel Experiment Steam Key

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Parallel Experiment cover

A Parallel Experiment Steam Key — also known as a CD Key or digital code — is the official activation code you redeem on Steam and keep in your library permanently. From €1.08 (-89%) at Difmark, Steam Account format · Cheapest official key: €2.10, 78% below the €9.75 Steam price · 8 verified stores, 8 offers in stock · Updated 04h 28min ago.

Historical prices
Medium price
Current minimum price
No payment fees With payment fees
Promoted store
Coupon
Gocdkeys -16% copy Copied!
1.29 1.08
Store Difmark
Global Icon
Region Global
Steam Account
Product type Steam Account
Standard
Edition Standard
Description Icon
Fees +€0.09

About Parallel Experiment

IMPORTANT: "Parallel Experiment" is a 2-player cooperative puzzle game with escape room-like elements. Each player must have their own copy on either mobile, tablet, PC or Mac (cross-platform play is supported).

In the game players take on the roles of two detectives who are often separated, each with different clues, and must work together to solve puzzles.  Internet connection and voice communication are essential. Need a Player Two? Join our community on Discord! Find the link on the side of our Steam page.

Parallel Experiment is a noir-inspired adventure with a comic book art style, featuring detectives Ally and Old Dog. While following the trail of the dangerous Cryptic Killer, they suddenly become his targets and are now unwilling participants in his twisted experiment. 

This is the second standalone chapter in the “Cryptic Killer” cooperative point-and-click puzzle game series. You can play Unboxing the Cryptic Killer first, if you want to learn more about our detectives and their nemesis, but Parallel Experiment can be enjoyed without prior knowledge.

KEY FEATURES

? Two Player Co-Op

In Parallel Experiment, players must rely on their communication skills as they’re separated and must each discover unique clues that are vital for solving puzzles on the other end. Teamwork is essential to crack the Cryptic Killer’s codes.

? Challenging Collaborative Puzzles

There are over 80 puzzles striking the perfect balance between challenging yet fair. But you're not facing them on your own! Communicate with your partner on how to best proceed, solve a puzzle on your end that unlocks the next step for them and discover a wide variety of puzzles from redirecting water flows, finding computer passwords and unlocking intricate locks, to deciphering cryptic ciphers, soldering electronic components, and even waking up a drunk!

?️ Two Can Play That Game

Looking for a break from the main investigation? Dive into a variety of retro-inspired mini-games designed with a fresh cooperative twist. Challenge each other to darts, Three in a Row, Match Three, Claw Machine, Push and Pull, and more. Think you know these classics? We’ve reinvented them for a whole new co-op experience

?️ Cooperative Dialogues

Uncover vital clues through collaborative conversations. NPCs respond dynamically to each player, offering new layers of interaction that only teamwork can unravel. Some conversations are puzzles in themselves that you need to solve together!

?️ A story told in panels

Our love for comic books shines in Parallel Experiment. Every cutscene is presented as a beautifully crafted comic book page, immersing you in a gripping, noir-inspired narrative.

How many pages did we create to tell the story? Almost 100 pages! Even we were surprised by how much it took, but every panel was worth it to deliver a story that keeps you on edge until the very last frame.

✍️ Draw on… Everything!

Every detective needs a notebook. In Parallel Experiment, players can jot down notes, sketch solutions, and interact with the environment in creative ways. But we all know what you're going to draw first…

? Annoy Each Other

​This is a key feature? Yes. Yes, it is. ​

​Each level will have some way for players to annoy their co-op partner: knock on a window to distract them, poke them, make their screens shake. You already know you'll be doing this just by reading it, right?

Parallel Experiment has a variety of mind-twisting challenges that push the boundaries of cooperative puzzle design, offering situations never seen before in other games.

How much does Parallel Experiment for PC cost right now?

Parallel Experiment for PC starts at €1.08 at Difmark, 89% under the €9.75 of the official store — but that is a shared account, not a key of your own. If you want a key tied to your own account, the cheapest is €2.10 at Eneba.

We have never recorded it cheaper than this.

That €1.08 already includes the Gocdkeys coupon, so apply it at checkout or the store will show you a higher price.

Just 8 stores stock it, 8 offers in all, so there is little here to push the price either way.

Shared account !
€1.08
with coupon €1.29
Cheapest, but the game is not yours
Steam Key
€2.10
with coupon €2.33
Stays on your account for good

Is it worth buying the Steam Key for Parallel Experiment now or waiting?

That €2.10 key is at its usual price: no bargain, no spike.

  • Those €2.10 are 52% below what it usually costs, measured on the store price.
  • Only 7 stores sell the Steam Key, and with that little competition the price barely moves.
  • Not counting today, 82 days out of the 197 days on record were this cheap or cheaper; the lowest it has ever cost is €1.41.
It is not a bad price, but it is not this Steam Key's floor either. If you are in no rush, we will tell you the day it drops.

Worked out from 708 daily records of the Steam Key for Parallel Experiment across 8 stores. See the full price history.

The price does not include each store's payment fees. The percentage is measured on the store price, without coupons, because that is how we record the history. The analysis only counts Key offers. Shared accounts, Steam Gift and physical editions stay out, because they are not the same product and their prices move differently.

Which Parallel Experiment format should you buy?

With the shared account at Difmark you log into an account that already owns the game: it is the cheapest route, but it never becomes yours and the seller keeps the credentials. If they ever lose or change them, you lose access.

The key at Eneba costs €1.02 more, but you redeem it on your own account and the game stays there for good. That is the difference between renting and buying.

Can you activate Parallel Experiment in US?

All 8 offers are Global, so the code redeems on any account no matter where it was created.

Why is there such an expensive Parallel Experiment offer?

One listing is worth ignoring: the Steam key that Humble Bundle has at €9.99 is more than 9 times the cheapest offer and is not what this game costs. The number to work from is €2.10 at Eneba.

Most common FAQs when buying Parallel Experiment for PC in digital format:

It is a key that will allow you to download the game Parallel Experiment on your PC from official download platforms.
As of 23/08/2026, in United States, the best price we have found in our selection of online stores that include the key for Parallel Experiment on PC is €2.10.
The Steam Key format is what we always recommend due to its ease of use and higher security compared to any other format. You just need to redeem the key in your account to download Parallel Experiment to your game library. The account format requires more complicated steps and is more prone to errors during activation.
The only issue we’ve encountered in 13 years is receiving a duplicate key that doesn’t work. In that case, simply contact the store where you bought Parallel Experiment, and they will provide a new key. You can also contact us, and we’ll help you out.
Delivery times vary by store. For example, in the case of Instatgaming, Eneba, G2a, or Kinguin, delivery is usually instant or takes just a few minutes. These stores rarely delay game deliveries.

Other stores may take 30–40 minutes depending on game availability. On release days, delivery times may be slightly longer.

If you notice an unusually long delay, contact the store or us, and we’ll resolve it as quickly as possible.
At Gocdkeys, we only list the most well-known stores that have passed our quality checks. One of the most important factors is good customer support, and all listed stores offer it.

There have been occasions when those services were overwhelmed, which is why we also offer 24/7 customer support to help resolve any issues or questions.

In any case, we always offer a 100% guarantee, so you won’t have any problems, and if you do, we’ll resolve them as soon as possible.

Need more help? Use our FAQs.

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