RealRTCW (HD mod for Return to Castle Wolfenstein game) is available for NixOS!

It takes some time to setup, but the benefit is great

  1. Obtain Return to Castle Wolfenstein game

  2. Download realrtcw mod data either from or

  3. Install NUR

  4. Install realrtcw engine from NUR: nix-env -f '<nixpkgs>' -iA nur.repos.gnidorah.realrtcw

  5. Copy files from realrtcw mod data folder over rtcw game folder or use overlayfs: sudo mount -t overlay overlay -o lowerdir=$HOME/.steam/steam/steamapps/common/Return\ to\ Castle\ Wolfenstein/Main,upperdir=$HOME/.steam/steam/steamapps/common/RealRTCW/Main,workdir=$HOME/.realrtcw/workdir $HOME/.realrtcw/main

  6. Run game: RealRTCW.x86_64