{
  description = "picoGym Practice Challenges";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
  };

  outputs = {
    self,
    nixpkgs,
  }: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};

    exercises = builtins.attrNames (builtins.readDir ./exercises);
    forAllExercises = nixpkgs.lib.genAttrs exercises;
  in {
    formatter.${system} = pkgs.alejandra;

    packages.${system} = forAllExercises (
      exercise:
        pkgs.writers.writePython3Bin "picoCTF_${exercise}" {
          libraries = with pkgs.python3.pkgs; [cryptography];
        } "${builtins.readFile ./exercises/${exercise}/main.py}"
    );

    apps.${system} = forAllExercises (
      exercise: {
        type = "app";
        program = "${self.packages.${system}.${exercise}}/bin/picoCTF_${exercise}";
      }
    );

    devShells.${system} =
      forAllExercises (
        exercise:
          pkgs.mkShellNoCC {
            packages = with pkgs; [python3];
          }
      )
      // {
        default = pkgs.mkShellNoCC {
          packages = with pkgs; [python3];
        };
      };
  };
}