Dig, Build & Explore. Manage a group of colonists as they attempt to survive underground on an alien world. Automated machine construction was sent ahead to create the Mercury facility, but something has gone wrong. Your colonists awake to find the facility in ruin.
All Reviews:
Positive (32) - 87% of the 32 user reviews for this game are positive.
Release Date:
Oct 16, 2017

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Early Access Game

Get instant access and start playing; get involved with this game as it develops.

Note: This Early Access game is not complete and may or may not change further. If you are not excited to play this game in its current state, then you should wait to see if the game progresses further in development. Learn more

What the developers have to say:

Why Early Access?

“As the sole developer of Mercury Fallen, early access is a great way to support the project and build a community of players than can assist in its development through feedback, reporting and exposure. The game has already benefited greatly from community feedback and through Early Access I hope to continue to grow the community as the game evolves. Join the adventure and help make Mercury Fallen the best it can be.”

Approximately how long will this game be in Early Access?

“While the game is playable and enjoyable, there is still ground to cover with new content and updates. I tentatively estimate the final version will be released in late 2018 or early 2019”

How is the full version planned to differ from the Early Access version?

“The focus of Mercury Fallen is building and exploration. Many of the core elements of building and management are in place, but will continue to be expanded upon. As development continues more focus will be put on exploration with the addition of discoveries, surface expeditions, story content and more.

Planned Features

  • Expanded technology tree
  • More crops and natural resources
  • More machines and possible upgrades
  • Explore the planet surface and uncover secrets and expansion opportunities
  • Discoverable items
  • Alien artifacts
  • Additional Cloning options and genetics
  • Deeper robotics system
  • Support for player created mods

What is the current state of the Early Access version?

“The game is in a playable state and has been enjoyed by many users via its initial release on platforms outside of Steam. The game contains many of the core elements that will continue to be added upon. In the current version of the game, the player can mine and grow resources, refine materials at crafting stations and expand the facility with additional rooms, machines and decorations. Manage colonist quirks, ailments and customization options. The focus of the game is to build, expand and explore.

Players can manage power/water distribution, resource management and more. The game has a solidly playable and enjoyable foundation and I will add even more great content.

Current Features

  • Mine and grow raw materials
  • Refine materials at various stations
  • Design and build facility rooms, machines and decorations
  • Manage colonists’ jobs and needs
  • Handle colonists’ injury and ailments
  • Control colonists’ names, jobs and outfit colors
  • Recover corrupted data to learn new blueprints
  • Take advantage of procedural generation, so that each new game is a new experience.
  • Grow clones and find additional colonists and robots hidden in collapsed areas of the map

Will the game be priced differently during and after Early Access?

“The game will most likely increase in price after early access.”

How are you planning on involving the Community in your development process?

“Most games are only as good as the community behind it. As a single developer, it's not always easy to address all individual concerns, but I am eager to communicate with my audience via email, community forums and social media. I do my best to listen to player feedback and deliver on what makes sense for the game. I also plan to involve the community in optional test versions of the game between main game updates.”
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Recent updates View all (40)

July 16

Alpha 0.14.5 Now Live!

Alpha 0.14.5 patch update is now live! This is a smaller update to fix and improve various elements of Mercury Fallen while development continues on the planetary exploration content update.

New Game Interface

The updated new game interface offers new map sizes. Map sizes are now 80x80 (Small), 100x100 (Normal) and 150x150 (Large).

HUD Inventory

The global inventory display now has a background and additional options. You can choose to view in list or category mode, toggle the display of items with zero quantity and sort alphabetically or by quantity.

Mining/Deconstruction Highlight

Tiles marked for mining and deconstruction are now visually distinct.

Additional Improvements

Notifications are no longer hidden behind open info windows, but instead will slide out with and show to the left of info windows. Edge scrolling now works on the right screen edge with an open info window and diagonal edge scrolling at the corner of the screen now works as well. The screen panel on the medi-bed will now light up when a doctor is treating a patient.


Thank you everyone for the feedback and excitement regarding the planetary exploration content update. Be sure to follow/join on Twitter, Facebook and Discord for the latest development information and screenshots. Check out the full release notes below for all the changes and fixes.

Twitter: https://twitter.com/mercuryfall
Facebook: https://www.facebook.com/mercfall/
Discord: https://discord.gg/WdndeXx

Release Notes
  • Added: New option buttons for the HUD Inventory list. Can now sort alphabetically and by quantity. Can toggle list/category view and hide items that have zero quantity.
  • Changed: HUD Inventory panel now has a background. Background opacity increases when moused over.
  • Changed: New game interface window elements have been rearranged and updated.
  • Changed: New game map sizes are now 80x80, 100x100 and 150x150
  • Changed: Added new background on various floating windows such as in game menu and load game.
  • Changed: Notification icons now slide out to the left of an open info window instead of being hidden behind it.
  • Changed: Reduced the amount of ore contained in deep mining tiles.
  • Changed: Mining and Deconstruction tile highlight are now visually different each other.
  • Changed: More noticeable work speed increase from colonist job levels.
  • Changed: Camera edge scrolling now works with info window open on right screen edge.
  • Changed: Fixed a couple of typos and updated some object descriptions.
  • Changed: Various colonist action costs updated to better behave with assigned job priorities.
  • Changed: Medi-bed screen now lights up when in use by a doctor.
  • Changed: Optimized various model textures for better performance.
  • Fixed: Disabled objects not disabled after loading save game. This fix will only apply to new save games.
  • Fixed: Multiple item chests spawning on top of each other
  • Fixed: Lock cursor to screen stops working after tabbing away from the game and returning.
  • Fixed: Water Pump/Power Generator providing resource if conduit under generator isn’t built yet.
  • Fixed: Colonist not using crop fields if aeroponic farms are placed, but there is no available plant nutrient.
  • Fixed: Camera Edge scrolling not working diagonally when moving mouse to the corner of the screen.
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July 12

Alpha 0.14.5 Test Build Now Available

Alpha 0.14.5 is now available on the Test Build branch. This is a "small" update/patch while work continues on the planetary exploration update. The planetary exploration update is coming along very well, but more development time is still needed.

Some of the new changes in Alpha 0.14.5 include new mining/deconstruction selection graphics, updated map sizes, HUD inventory options, colonist priority improvements, updated UI elements and more. See the release notes below for the full list of changes and fixes.

For more information about the 0.14.5 Test Build, including release notes:

What is the Test Build branch?
0 comments Read more
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About This Game

The game is in the early access alpha stage and is not yet feature complete. Please read the Early Access info at the top for more details.

Manage a group of intrepid colonists as they attempt to survive on an alien world. Automated machine construction was sent ahead to create the underground Mercury Facility, but something has gone wrong. Your colonists awake to find the facility in ruin. Expand the colony, grow crops, build structures, recover technologies and discover lost secrets to ensure the survival of your new home away from home.

Mercury Fallen is a simulation game which focuses on building, crafting and exploration. The choices you make will decide the fate of your colony.

Dig & Explore

Dig out and explore the surrounding area for raw resources and discover lost colonists, collapsed facility rooms, discoveries and more.

Grow & Manage Resources

Grow terrestrial and assorted alien crops for materials and meal production. Manage production chains to turn raw ingredients into meals, building materials and robots.

Manage Colonists

Colonists are indirectly controlled by placing buildable objects, managing craft queues/rosters at production stations, assigning job roles and configuring job priorities. Each colonist has their own set of quirks which affects a colonist in various ways.

Discoveries & Technology

Discover blueprints and data logs hidden away in lost item chests to uncover new technology and story content. Manage research projects to unlock numerous machines, structures, recipes and more.

  • Grow clones and assemble robots to expand your facility population
  • Manage colonists’ injuries, ailments, jobs, quirks and needs
  • Grow various terrestrial and alien crops for material and meal production.
  • Uncover additional colonists, robots and discoveries hidden in collapsed sections of the Mercury Facility
  • Build and manage power and water resources.
  • Customize your colonists name and outfit colors
  • Research technology to unlock new structures, recipes, crops and more.
  • In game guide
  • Take advantage of procedural generation, so that each new game is a new experience.
  • * Explore the planet surface in search of new resources, technologies and artifacts.
  • * Take on missions and uncover various history and information through choice driven story narratives.

* = Planned features still in development

System Requirements

Mac OS X
    • OS: Windows 7 / 8 / 10
    • Processor: 2.4 GHz Dual Core
    • Memory: 4 GB RAM
    • Graphics: DirectX 11 compatible card (shader model 3)
    • DirectX: Version 11
    • Storage: 300 MB available space
    • Memory: 8 GB RAM
    • Additional Notes: 64-bit CPU and OS
    • OS: OS X 10.9+
    • Processor: 2.4 Ghz Intel Core i5
    • Memory: 4 GB RAM
    • Graphics: Intel HD 4600 (AMD or NVIDIA equivalent)
    • Storage: 300 MB available space
    • Additional Notes: 64-bit CPU and OS
    • Memory: 8 GB RAM
    • Additional Notes: 64-bit CPU and OS
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