diff --git a/apks/by-name/sm/smouldering_durtles/package.nix b/apks/by-name/sm/smouldering_durtles/package.nix
index b98a8b1..a138bbf 100644
--- a/apks/by-name/sm/smouldering_durtles/package.nix
+++ b/apks/by-name/sm/smouldering_durtles/package.nix
@@ -1,5 +1,45 @@
-{lib, pkgs, ...}: 
-
+{lib, pkgs, android-nixpkgs, gradle-dot-nix,...}: 
+let
+  android-sdk = android-nixpkgs.sdk.${pkgs.stdenv.hostPlatform.system} (sdkPkgs: with sdkPkgs; [
+    # Useful packages for building and testing.
+    build-tools-34-0-0
+    cmdline-tools-latest
+    platform-tools
+    platforms-android-34
+  ]);
+  gradle-init-script = 
+    (import gradle-dot-nix {
+        inherit pkgs;
+        gradle-verification-metadata-file = ./verification-metadata.xml;
+    }).gradle-init;
+in
+
+pkgs.stdenv.mkDerivation rec {
+  name = "smouldering-durtles-apk";
+  version = "1.2.3";
+
+  src = pkgs.fetchFromGitHub {
+    owner = "jerryhcooke";
+    repo = "smouldering_durtles";
+    tag = "v${version}";
+    hash = "sha256-xk8xjvUCpHojwdoaBhiXPfX2Tm1iXF8pbphk/FFt1P0=";
+  };
+          JDK_HOME = "${pkgs.jdk21.home}";
+        ANDROID_HOME = "${android-sdk}/share/android-sdk";
+
+        nativeBuildInputs = [
+            android-sdk
+            pkgs.gradle
+            pkgs.jdk21
+        ];
+        buildPhase = ''
+          gradle build --info -I ${gradle-init-script} --offline --full-stacktrace -Dorg.gradle.project.android.aapt2FromMavenOverride=$ANDROID_HOME/build-tools/34.0.0/aapt2
+        '';
+        installPhase = ''
+          mkdir -p $out
+          cp -r ./app/build/outputs/apk/release/app-release-unsigned.apk $out
+        '';
+}