diff --git a/machines/cray/configuration.nix b/machines/cray/configuration.nix
index a3c3546..5d0905e 100644
--- a/machines/cray/configuration.nix
+++ b/machines/cray/configuration.nix
@@ -4,6 +4,7 @@
 
 { sources ? import ../../nix
 , pkgs ? sources.pkgs { }
+, lib
 , ...
 }:
 
@@ -22,8 +23,6 @@ in
   boot.loader.efi.canTouchEfiVariables = true;
   boot.loader.efi.efiSysMountPoint = "/boot/efi";
 
-  nix.useSandbox = false;
-
   boot.loader.systemd-boot.enable = false;
   boot.loader.grub = {
     enable = true;
@@ -62,6 +61,12 @@ in
   services.printing.drivers = with pkgs; [ splix ];
 
 
+  programs.steam.enable = true;
+  nixpkgs.config.allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) [
+    "steam"
+    "steam-original"
+    "steam-runtime"
+  ];
 
   # List packages installed in system profile. To search, run:
   environment.systemPackages = with pkgs; [ vim wget curl git ];