A downloadable game for Windows

Buy Now$5.00 USD or more

Isostasy. Equilibrium. The balance between opposing forces. Hot and cold. Solid and liquid. Light and dark. Peth-Luk and Gol-Luk, the gods that emerged from the Isostasy at the initiation of the current Fathom...but those are only myths...

You play as Beihnn. Explore eight different zones with different terrain. Find items to help you progress, talk to other characters for hints, solve puzzles, and figure out how to defeat 9 different bosses.

This game is an NES ROM file, playable on any NES emulator or flash cartridge that supports the UNROM mapper (almost all do). I recommend Mesen.

The standalone Windows PC version has the ability to save games, including all explored map data. Extract the contents of the zip file to your preferred directory and run Isostasy.exe to play.

The Isostasy website, including game instructions.


Buy Now$5.00 USD or more

In order to download this game you must purchase it at or above the minimum price of $5 USD. You will get access to the following files:

Isostasy.nes 64 kB
Isostasy.zip 27 MB

Download demo

IsostasyDemo.nes 64 kB
IsostasyDemo.zip 27 MB

Development log


Log in with itch.io to leave a comment.

How big is the demo? I've just reached the Marine area, and wondering how close to the end I am.

You're close. The demo omits the last 2 zones, Space and Fortress. once you exit the Marine zone you'll get a message thanking you for playing the demo and asking you to buy the full version. 

I have been told that the demo is too long, but I wanted to give people a fair chance to decide whether they really wanted to finish the game before paying for it. if a player gets to the end of the demo and says "meh, that's good enough, I'm done now", then that's OK with me.

Yah, if your goal is to sell copies, I would agree with them about it being too long.