A downloadable game for Windows


Manage a group of colonists as they attempt to survive underground in an alien world. Automated machine construction was sent ahead to create the Mercury facility, but something has gone wrong and your colonists awake to find the facility in ruin. Build structures, recover technologies and send out expeditions to the surface to ensure the survival of your new found home away from home.

Colony Expansion

Dig out and gather resources from the surrounding area to expand and rebuild the Mercury Facility. Place rooms, structures and furniture to refine resources, recover data for blueprints, grow crops and handle colonist needs.

Colonist Professions

Colonists will need to be assigned a profession before doing various actions. Selecting a colonist and setting their profession will determine what they can and can't do. All colonists can carry and deliver items by default.


Rooms are determined by the type of floor that is constructed. Many structures and machines can only be placed in certain types of rooms.

Data Recovery

The Mercury Facility has fallen in to ruin including the mission blueprint data. Set a scientist to start recovering the data at the computer station.

Procedural Generation

Resources, caves, water generation and more are all procedurally generated using a customizable seed value when starting the game.

Alpha Demo

Mercury Fallen is still in alpha development and not feature complete. While I've been working to create a stable alpha demo there are likely to be issues and/or bugs still in the game. There is a lot more content currently being worked on as well as new features like planetary surface expeditions.

In this early demo the following features are available. I'm actively looking for feedback to further improve the core concept of the game.

  1. Mine out surrounding areas for resources (Miner profession)
  2. Construct a computer station and recover corrupted data. (Scientist Profession)
  3. Build additional rooms/hallways and start power and productions facilities including the smelter and cook station. (Builder Profession)
  4. Grow crops to generate food (Botanist Profession)
  5. Setup storage rooms with storage containers for storing your resources.
  6. Additional help in the game menu by pressing the escape key.

Alpha Demo 1.1 Update

The version 1.1 update has been released and can be downloaded below. For more details please check out the update info on the Mercury Fallen website.


The alpha demo is packaged in .zip format. Simply unzip the archive where you wish to install.

Follow progress at:

Website: http://www.mercuryfallen.com

Twitter: @tpelham42

Facebook: https://www.facebook.com/mercfall/

More information

Published21 days ago
AuthorNitrous Butterfly
Tags3D, colony, sci-fi, simulation
Average sessionAbout an hour
InputsKeyboard, Mouse

Install instructions

The alpha demo is packaged in .zip format. Simply unzip the archive where you wish to install.


MercuryFallen_AlphaDemo_1.1.zip (27 MB)

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