diff --git a/modules/openarena-instance.nix b/modules/openarena-instance.nix
new file mode 100644
index 0000000..209b1ea
--- /dev/null
+++ b/modules/openarena-instance.nix
@@ -0,0 +1,28 @@
+{config, lib, pkgs, ...}:
+
+let
+  cfg = config.services.openarena-instance;
+
+  openarenatbz2 = pkgs.fetchurl {
+    url = "https://johannes.dynip.online/files/cwace-openarena-server.tbz2";
+    sha256 = "f47c4cc5aaa7f59aa9d6ad4d76e9f4255cc8a88d9cfc2ba884bd8ab7ebf3ce00";
+  };
+
+in {
+  options.services.openarena-instance = {
+    # ... existing options ...
+  };
+
+  config = {
+    systemd.services."openarena@${cfg.name}" = {
+      # ... existing service config ...
+
+      preStart = ''
+        mkdir -p /var/lib/openarena-${cfg.name}
+        tar -xf ${openarenatbz2} -C /var/lib/openarena-${cfg.name} --strip-components=1
+      '';
+    };
+
+    # ... existing firewall config ...
+  };
+}
\ No newline at end of file