A Mercury Fallen 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 €0.39 (-98%) at Gameseal, 98% below the €24.50 Steam price · 16 verified stores, 17 offers in stock · Updated 03h 22min ago.
Official stores are authorized distributors, and while their prices may be higher than Key stores, their reliability is 100%.
“Choose it if you don’t mind the price difference”Key stores are resellers and marketplaces, which is why they are usually cheaper than official stores. We only show the best ones, so you can rest assured. Plus, we offer our guarantee against any issues.
“Choose it if you’re looking for a great discount”( You have
)
( You have
)
After a long journey to a distant planet, your colonists were supposed to wake up and begin building their new home. But something went wrong. Their stasis capsules malfunctioned, and when they finally awakened, the underground facility they were meant to inhabit has fallen into ruin.
Now, it's up to you to restore the base, manage resources, and expand across the planet’s surface—all while uncovering the secrets of this alien world and ensuring your colony thrives.
Mercury Fallen is a self-paced sci-fi colony management experience with a focus on exploration, expansion, and story-driven progression. Deconstruct the remnants of an abandoned facility, construct new rooms, conduct research, and grow your colony both underground and across the planet’s surface.

Tear down the ruins, scavenge resources, and transform the underground into a thriving colony. Design essential rooms, power systems, and infrastructure to support your growing population.
Uncover additional colonists, robots, and discoveries hidden in collapsed sections of the Mercury Facility.
Build and manage power and water resources to sustain your growing colony.


Unlock advanced technology, craft vital upgrades, and send colonists on daring expeditions to uncover alien artifacts, lost technology, and the secrets buried beneath the planet’s surface.
Research technology to unlock new rooms, crafting recipes, crops, and facility upgrades.
Discover alien plant life and new resource types to fuel your colony’s expansion.


Expand beyond the underground with surface expeditions and resource extraction.
Construct vehicles to explore alien terrain and extract rare materials.
Expand your power network above ground with multiple energy generation methods.
Send colonists to explore points of interest, uncovering new resources, hidden lore, and lost technology.


Every colonist has a story. Some will thrive, others will struggle—but they all rely on you. Keep them housed, happy, and well-fed while managing their quirks, relationships, and unexpected disasters. As your colony grows, expand your workforce with clones and automated robots to optimize daily operations.

A Colony That Feels Alive: Colonists have unique quirks, moods, and challenges. Keep them happy, or risk disaster as stress builds and problems arise. Manage colonists’ injuries, ailments, jobs, quirks, and needs to ensure long-term survival.
Build & Design Essential Spaces: Construct bedrooms, recreation areas, crafting stations, and more to meet the growing needs of your colony.
Customize your Colonists: Give your settlers unique names, outfits, and equipment, making each colonist truly your own.
Cultivate Alien and Terrestrial Crops: Grow a variety of terrestrial and alien crops to sustain your colony and fuel advanced production chains.
Expand Your Workforce: Grow clones and assemble robots to expand your facility population.
Brace for the Unexpected: React to and prepare for random events, including cave-ins and crop disease.
Procedurally generated worlds ensure a fresh experience each time, while Steam Workshop modding support lets you expand and customize your gameplay. Dynamic events introduce unexpected challenges and opportunities, making each colony feel unique.
Every colony tells a different story. Will yours flourish or fall? With procedurally generated worlds, dynamic challenges, and a blend of underground base-building, planetary exploration, and rich storytelling, Mercury Fallen is an ever-evolving adventure—whether you prefer a laid-back experience or a challenge that keeps you on your toes.
Mercury Fallen for PC starts at €0.39 at Gameseal, a Steam key, which is 98% under the €24.50 it costs on the official store.
That €0.39 already includes the SEAL17CDK coupon, so apply it at checkout or the store will show you a higher price.
16 stores carry it, 17 offers in total and 16 available right now; the figure above is the cheapest of the ones you can actually order.
That puts it 41% under its average of €0.66 since 2025, so today is a better entry point than most days of its life.
That €1.47 key is at one of its best prices.
Worked out from 947 daily records of the Steam Key for Mercury Fallen across 13 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.
16 of the 17 offers work on US — the Global ones plus the ones issued for your own region.
One listing is worth ignoring: the Steam key that Greenmangaming has at €24.50 is more than 62 times the cheapest offer and is not what this game costs. The number to work from is €0.39 at Gameseal.
| Release date | 08/22/2023 |
| Users rating |
|
| Steam comments |
Very Positive
Very Positive
(254
Comments)
|
| Categories |
|
| Tags | |
To win the tickets, your email in Gocdkeys must match your email in Discord.
The comment must be original, with a minimum of 250 characters, will be reviewed manually and can take up to 48h to be approved.
We use cookies to provide you with the best experience on our website. You can review our privacy policy By clicking "Accept All", you agree to the use of all cookies.
Share Gocdkeys URLs on gaming websites/forums, and we will grant you +120 Tickets
How does it work?
Received. Give us 48 hours to verify it and send you your tickets.
Set Price Alert
{game_name} for {game_platform}
We will notify you when...
Alert created successfully!
Error creating the alert!
The minimum price cannot be higher than the original price
The minimum price cannot be empty
The minimum price is not valid
You already have an alert created for this game
Create your free account to save the alert, or just leave us your email and we'll notify you when it drops below your price.
Payment fees not included.
Use the Tickets to spin the Gocdkeys Wheel of Fortune and win free video games!
Before playing our Wheel of Fortune
Register!How to get tickets?
Use the Tickets to spin the Gocdkeys Wheel of Fortune and win free video games!
Unfortunately this game is not yet available in our wheel of fortune.
Try your luck with another game!
How to get tickets?
What do our users think of Mercury Fallen for PC Digital?
0
Mercury Fallen is a deep sci-fi colony management game that has you rebuilding an underground base on a distant planet after a catastrophic event. Explore, research, develop, expand your colony, and discover the alien mysteries lying below the surface. Played at a leisurely pace with a big emphasis on story.
Rate and comment: your experience matters!
You are registered as: