A downloadable prototype for Windows, macOS, and Linux

King under the Mountain is a simulation-based settlement-building strategy game set in a fantasy world, for Windows, Mac and Linux. 

Please note this is a pre-alpha prototype containing only the most basic features of the full game. In July 2018 we launched a successful Kickstarter campaign (which you can check out at https://www.kickstarter.com/projects/rocketjumptechnology/king-under-the-mountai... ) and this marks the end of the free version. The more feature complete, paid version will be coming to Itch.io in February 2019 and you can pre-order it from https://kingunderthemountain.backerkit.com/hosted_preorders

Players take charge of a group of settlers founding a new colony, planning out work to be done and designing the rooms and structures that make up a burgeoning society. The focus is on having a deep simulation of characters and their behaviour as well as the world and environment they inhabit.

Please note this is very early in development so most features are missing - we would definitely *not* call it a complete game at this point. However it should give a good impression of where we're going, and more importantly, prove the game actually exists and is something we're capable of developing :)

Currently this build supports English, German, Spanish, French, Italian, Russian, Polish and Portuguese (both European and Brazilian).

Install instructions

Windows - Just unzip somewhere and run the King under the Mountain.exe, as long as you're on a 64-bit version of Windows it should work! If not, please let me know.

Mac - Similarly the app should run on any modern version of Mac OS (if not please let us know!), just unzip and run.

Alternatively you can install the Java 8 runtime and click the "undermount-desktop.jar" to launch the game (which should also work on Linux distributions).


King under the Mountain Pre-alpha 7.4 win64.zip 152 MB
King under the Mountain Pre-alpha 7.4 macosx.zip 150 MB
King under the Mountain Pre-alpha 7.4 linux64.zip 163 MB

Development log

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