Install on Steam Deck


This guide is based on Linux installation guide.

Specific Steam Deck guide will be provided in the future as well.



OpenNox is not a standalone game. It requires a copy of original Nox installed!

See GoG for purchase options.

  1. Install original Nox from GoG (via Lutris or Heroic).
  2. Install OpenNox via Flatpak.


HD version

Installation should create a “OpenNox HD” shortcut in the start menu. Alternatively: run opennox-hd binary from terminal.


HD version will not join public legacy servers!

This is done for fairness reasons, since not everyone runs OpenNox in HD. You can still host your own server for your friends to join.

Legacy version

Installation should create a “OpenNox” shortcut in the start menu. Alternatively: run opennox binary from terminal.


Legacy version will not join HD servers.

Make sure to run the same version as the server when playing online.


OpenNox doesn’t start

Try starting opennox from the terminal. Check if there are any error messages there.

If it doesn’t help, open opennox.yml in OpenNox installation directory in a text editor. Find section similar to this:

  data: /home/user/some/path/to/Nox

Change the path manually to a folder where your copy of Nox is installed. Restart OpenNox.

If it still doesn’t work, please ping us on OpenNox Discord in #feedback channel. It will help if you share opennox.log located in log folder in OpenNox install directory.

Can’t connect to a server: Version mismatch

As was explained in the installation section, HD and legacy versions won’t join servers of the opposite version.

Most online servers still run legacy version, so if you want to join them, you must run legacy version of OpenNox as well. Make sure to try a correct version when joining a server.