diff --git a/flake.nix b/flake.nix
index 3609535d..0e576475 100644
--- a/flake.nix
+++ b/flake.nix
@@ -58,9 +58,7 @@
           # ancmp = ./ancmp;
         })
         // {
-          default = packages.buildNinecraftInstance {
-            version = packages.mcpeVersions.a0_6_1;
-          };
+          default = packages.ninecraft-demo;
         };
       apps = {
         extract = {
diff --git a/nix/pkgs/buildNinecraftInstance.nix b/nix/pkgs/buildNinecraftInstance.nix
index ada3d0ae..cf65d1e6 100644
--- a/nix/pkgs/buildNinecraftInstance.nix
+++ b/nix/pkgs/buildNinecraftInstance.nix
@@ -9,6 +9,8 @@
   stdenvNoCC,
   writeShellScript,
   writeText,
+  curl,
+  ...
 }: {
   name ? "ninecraft",
   homeDir ? "$(mktemp -d)",
@@ -17,6 +19,7 @@
   options ? null,
   version ? mcpeVersions.a0_6_1,
   useNixGL ? false,
+  versionParam ? false,
   ...
 }: let
   optionsTxtContent = lib.concatStringsSep "\n" (
@@ -51,49 +54,57 @@
       // options
     )
   );
+  ninecraftLib =
+    writeShellScript "ninecraft-lib" (builtins.readFile ./ninecraft-lib.sh);
   optionsTxt = writeText "options.txt" optionsTxtContent;
-  startScript = writeShellScript "start-ninecraft-${name}.sh" ''
-    homeDir=${homeDir}
-    ${
-      lib.optionalString (gameDir != null) ''
-        gameDir=${gameDir}
+  startScript =
+    writeShellScript "start-ninecraft-${name}.sh" ''
+      source ${ninecraftLib}
+      homeDir=${homeDir}
+      ${
+        lib.optionalString (gameDir != null) ''
+          gameDir=${gameDir}
+
+          # Install Version
+          if [ -z "$1" ]; then
+            installVersion "${version}"
+          else
+            installVersion "$1" "${
+            if stdenvNoCC
+.hostPlatform.isx86
+            then "x86"
+            else ""
+          }"
+          fi
 
-        # Version
-        if [ ! -d $gameDir ]; then
-          mkdir -p $gameDir
+        ''
+      }
+      ${lib.optionalString (builtins.isAttrs options) ''
+        # Options
+        if [[ ! -d "$homeDir/storage/games/com.mojang/minecraftpe" ]]; then
+          mkdir -p $homeDir/{mods,global_overrides,storage/games/com.mojang/minecraftpe}
         fi
-        if [[ ( ! -d "$gameDir/lib"  ) || ( ! -d "$gameDir/res"  ) || ( ! -d "$gameDir/assets"  ) ]]; then
-          cp -r "${version}"/{assets,lib,res} "$gameDir"
-          chmod -R u+w "$gameDir"/{assets,lib,res}
+        if [[ -L $homeDir/options.txt ]] || [[ ! -e $homeDir/options.txt ]]; then
+          cp -sf "${optionsTxt}" $homeDir/options.txt
+        fi
+        if [[ -L "$homeDir/storage/games/com.mojang/minecraftpe/options.txt" ]] || [[ ! -e "$homeDir/storage/games/com.mojang/minecraftpe/options.txt" ]]; then
+          cp -sf "${optionsTxt}" "$homeDir/storage/games/com.mojang/minecraftpe/options.txt"
         fi
-      ''
-    }
-    ${lib.optionalString (builtins.isAttrs options) ''
-      # Options
-      if [[ ! -d "$homeDir/storage/games/com.mojang/minecraftpe" ]]; then
-        mkdir -p $homeDir/{mods,global_overrides,storage/games/com.mojang/minecraftpe}
-      fi
-      if [[ -L $homeDir/options.txt ]] || [[ ! -e $homeDir/options.txt ]]; then
-        cp -sf "${optionsTxt}" $homeDir/options.txt
-      fi
-      if [[ -L "$homeDir/storage/games/com.mojang/minecraftpe/options.txt" ]] || [[ ! -e "$homeDir/storage/games/com.mojang/minecraftpe/options.txt" ]]; then
-        cp -sf "${optionsTxt}" "$homeDir/storage/games/com.mojang/minecraftpe/options.txt"
-      fi
 
-    ''}
-    # Mods
-    ${lib.concatMapStrings (mod: "cp -r ${mod}/* $homeDir") mods}
+      ''}
+      # Mods
+      ${lib.concatMapStrings (mod: "cp -r ${mod}/* $homeDir") mods}
 
-    ${lib.optionalString useNixGL "\"${nixgl.auto.nixGLDefault}\" \\:quit"}
-    "${lib.getExe ninecraft}" \
-     --game "${
-      if (isNull gameDir)
-      then version
-      else "$gameDir"
-    }" \
-     --home "$homeDir" \
-     "$@"
-  '';
+      ${lib.optionalString useNixGL "\"${nixgl.auto.nixGLDefault}\" \\:quit"}
+      "${lib.getExe ninecraft}" \
+       --game "${
+        if (isNull gameDir)
+        then version
+        else "$gameDir"
+      }" \
+       --home "$homeDir" \
+       "$@"
+    '';
 in
   stdenvNoCC.mkDerivation {
     name = "ninecraft-${name}";
@@ -110,7 +121,10 @@ in
       runHook postInstall
     '';
 
-    desktopItems = makeNinecraftDesktopItems {
-      instance = name;
-    };
+    desktopItems = lib.optional true (builtins.elemAt (
+        makeNinecraftDesktopItems {
+          instance = name;
+        }
+      )
+      0);
   }
diff --git a/nix/pkgs/default.nix b/nix/pkgs/default.nix
index 0d426247..2dcc1b0a 100644
--- a/nix/pkgs/default.nix
+++ b/nix/pkgs/default.nix
@@ -41,8 +41,9 @@
     rev = "main";
     hash = lib.getHash name;
   }),
-  flakeRoot?../..,
+  flakeRoot ? ../..,
   ninecraft-extract ? ../../tools/extract.sh,
+  ...
 }: rec {
   fetchApk = pkgs.callPackage ./fetchApk.nix {};
   mcpeVersions =
@@ -66,7 +67,9 @@
   };
 
   ninecraft-nixgl = buildNinecraftInstance {
-    version = mcpeVersions.a0_6_1;
+    versionParam = true;
+    # homeDir = "$HOME/.local/share}/ninecraft";
+    gameDir = "$(mktemp -d)";
     useNixGL = true;
   };
   # test = pkgs.callPackage ./test.nix {
@@ -76,4 +79,12 @@
   #     buildNinecraftMod
   #     ;
   # };
+  # ninecraft-demo = pkgs.callPackage ./ninecraft-demo.nix {
+  #   inherit ninecraft ninecraft-extract;
+  # };
+  ninecraft-demo = buildNinecraftInstance {
+    # homeDir = "$HOME/.local/share}/ninecraft";
+    versionParam = true;
+    gameDir = "$(mktemp -d)";
+  };
 }
diff --git a/nix/pkgs/desktop.nix b/nix/pkgs/desktop.nix
index f7c2530f..a31bf812 100644
--- a/nix/pkgs/desktop.nix
+++ b/nix/pkgs/desktop.nix
@@ -3,6 +3,7 @@
   lib,
   ninecraft-extract,
   mcpeVersions,
+  ...
 }: {
   instance ? null,
   version ? mcpeVersions.a0_6_1,
@@ -21,11 +22,12 @@ in [
       icon = "${version}/res/drawable/iconx.png";
       exec = "ninecraft${
         if (instance == null)
-        then " --game \"${gameDir}\" --home \"${homeDir}\""
-        else "-${instance}"
+        then " --game \"${gameDir}\" --home \"${homeDir}\" %u"
+        else "-${instance} %u"
       }";
       categories = ["Game" "AdventureGame"];
       keywords = ["mcpe" "android" "mcpi" "pocket" "edition"];
+      mimeTypes = lib.optional (instance != null) "application/vnd.android.package-archive";
     }
   )
 
diff --git a/nix/pkgs/fetchApk.nix b/nix/pkgs/fetchApk.nix
index 5eb390b5..8c8d1bbe 100644
--- a/nix/pkgs/fetchApk.nix
+++ b/nix/pkgs/fetchApk.nix
@@ -1,6 +1,7 @@
 {
   fetchzip,
   lib,
+  ...
 }: options:
 fetchzip (options
   // {
diff --git a/nix/pkgs/meta.nix b/nix/pkgs/meta.nix
index effb7b1a..89ad9228 100644
--- a/nix/pkgs/meta.nix
+++ b/nix/pkgs/meta.nix
@@ -1,4 +1,4 @@
-{lib}: {
+{lib, ...}: {
   description = "MCPE Launcher";
   longDescription = "A mcpe 0.1 .0 - 0.10 .5 launcher for linux and windows";
   homepage = "https://github.com/MCPI-Revival/Ninecraft";
diff --git a/nix/pkgs/ninecraft-lib.sh b/nix/pkgs/ninecraft-lib.sh
new file mode 100644
index 00000000..135b5a26
--- /dev/null
+++ b/nix/pkgs/ninecraft-lib.sh
@@ -0,0 +1,46 @@
+set -e
+# set -x
+
+installVersion() {
+	if [[ -n "$gameDir" && -r "$gameDir" ]]; then
+		VERSION=$1
+        ARCH=$2
+		VERSION_PATH=$(readlink -f $VERSION)
+		
+		pushd "$gameDir"
+		rm -rf assets res lib
+
+		if [[ -d "$VERSION_PATH" ]]; then
+			cp -r "$VERSION_PATH"/{assets,lib,res} "$gameDir"
+		else
+
+			if [[ $VERSION =~ ^https?:\/\/ ]]; then
+				URL=$VERSION
+			else
+			if [[ -z "$ARCH" ]]; then
+
+				URL="https://archive.org/download/MCPEAlpha/PE-a${VERSION}.apk"
+				else
+				URL="https://archive.org/download/MCPEAlpha/PE-a${VERSION}-${ARCH}.apk"
+				fi
+			fi
+
+			if [[ -f "$VERSION_PATH" ]];  then
+				APK=$VERSION_PATH
+			else
+				echo "Downloading Minecraft PE from $URL..."
+				curl -L --output mcpe.apk "$URL"
+				APK=$(pwd)/mcpe.apk
+			fi
+		
+			echo "Extracting APK $APK..."
+			ninecraft-extract "$APK"
+		fi
+
+		
+		chmod -R u+w "$gameDir"/{assets,lib,res}
+
+		pwd
+		ls	
+	fi
+}
\ No newline at end of file
diff --git a/nix/pkgs/test.nix b/nix/pkgs/test.nix
index 9a5c6755..fc849861 100644
--- a/nix/pkgs/test.nix
+++ b/nix/pkgs/test.nix
@@ -3,6 +3,7 @@
   buildNinecraftMod,
   mcpeVersions,
   writeTextDir,
+  ...
 }:
 buildNinecraftInstance {
   name = "test";
diff --git a/nix/pkgs/versions.nix b/nix/pkgs/versions.nix
index bff4579c..100d3f57 100644
--- a/nix/pkgs/versions.nix
+++ b/nix/pkgs/versions.nix
@@ -2,6 +2,7 @@
   lib,
   fetchApk,
   stdenv,
+  ...
 }: let
   versions = {
     a0_1_0 = {