diff --git a/.gitignore b/.gitignore
index 0fa6b67..e2b8a2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -44,3 +44,4 @@ app.*.map.json
 /android/app/debug
 /android/app/profile
 /android/app/release
+/ios/Runner
\ No newline at end of file
diff --git a/android/build.gradle b/android/build.gradle
index c505a86..3f328b5 100644
--- a/android/build.gradle
+++ b/android/build.gradle
@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.3.50'
+    ext.kotlin_version = '1.4.32'
     repositories {
         google()
         jcenter()
diff --git a/lib/2048Screen.dart b/lib/2048Screen.dart
index 1a17e6a..1cc8dc7 100644
--- a/lib/2048Screen.dart
+++ b/lib/2048Screen.dart
@@ -158,16 +158,17 @@ class _Game2048State extends State<Game2048Screen> with TickerProviderStateMixin
 
   }
 
+
+  //Save game progress
   void saveState(){
     if(isGameRunning){
-
       //save columnSize, rowSize, score and values
       String saveGame = "$columnSize;$rowSize;$_score;" + values.join(',');
       Provider.of<StatisticsModel>(context, listen: false).setValue(StatConst.KEY_GAME_2048, StatConst.KEY_SAVEGAME_1, saveGame);
     }
     //save moves done
     String movesDone = Provider.of<StatisticsModel>(context, listen: false).getValue(StatConst.KEY_GAME_2048, StatConst.KEY_MOVES_PERFORMED);
-    //TODO update value here
+
     int updatedMovesDone = int.parse(movesDone) + _movesPerformed;
     Provider.of<StatisticsModel>(context, listen: false).setValue(StatConst.KEY_GAME_2048, StatConst.KEY_MOVES_PERFORMED, "$updatedMovesDone");
     _movesPerformed = 0;
@@ -226,7 +227,10 @@ class _Game2048State extends State<Game2048Screen> with TickerProviderStateMixin
       values = valuesAfter;
       _isInAnimation = false;
     });
-
+    //save current game progress
+    if(isGameRunning){
+      saveState();
+    }
     startTimerAppearing();
 
 
@@ -291,6 +295,8 @@ class _Game2048State extends State<Game2048Screen> with TickerProviderStateMixin
     }
   }
 
+  //Update strings for final stats on the screen and game stats in the key-value store
+  //Delete existing savegame
   void setGameOver(){
     isGameRunning = false;
     //save stats
@@ -605,7 +611,7 @@ class _Game2048State extends State<Game2048Screen> with TickerProviderStateMixin
   }
 
   void onExitPressed(){
-    saveState();
+    saveState(); //save game progress
     Navigator.pop(context);
   }
 
diff --git a/lib/ConnectFourScreen.dart b/lib/ConnectFourScreen.dart
index 3075765..aa9d4e1 100644
--- a/lib/ConnectFourScreen.dart
+++ b/lib/ConnectFourScreen.dart
@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:audioplayers/audio_cache.dart';
 import 'package:audioplayers/audioplayers.dart';
 import 'dart:io';
 import 'dart:math';
diff --git a/pubspec.lock b/pubspec.lock
index 5351e7b..6d0aae3 100644
--- a/pubspec.lock
+++ b/pubspec.lock
@@ -16,12 +16,19 @@ packages:
     source: hosted
     version: "2.0.0"
   async:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: async
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.5.0"
+    version: "2.6.1"
+  audioplayers:
+    dependency: "direct main"
+    description:
+      name: audioplayers
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.19.1"
   boolean_selector:
     dependency: transitive
     description:
@@ -70,7 +77,7 @@ packages:
       name: cupertino_icons
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.2"
+    version: "1.0.3"
   fake_async:
     dependency: transitive
     description:
@@ -84,14 +91,14 @@ packages:
       name: ffi
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.0.0"
+    version: "1.1.2"
   file:
     dependency: transitive
     description:
       name: file
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "6.1.0"
+    version: "6.1.2"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -114,6 +121,20 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
+  http:
+    dependency: transitive
+    description:
+      name: http
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.13.3"
+  http_parser:
+    dependency: transitive
+    description:
+      name: http_parser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.0.0"
   image:
     dependency: transitive
     description:
@@ -163,13 +184,27 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.8.0"
+  path_provider:
+    dependency: transitive
+    description:
+      name: path_provider
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
   path_provider_linux:
     dependency: transitive
     description:
       name: path_provider_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.2"
+  path_provider_macos:
+    dependency: transitive
+    description:
+      name: path_provider_macos
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.2"
   path_provider_platform_interface:
     dependency: transitive
     description:
@@ -183,35 +218,42 @@ packages:
       name: path_provider_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.3"
+  pedantic:
+    dependency: transitive
+    description:
+      name: pedantic
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.11.1"
   petitparser:
     dependency: transitive
     description:
       name: petitparser
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.0.2"
+    version: "4.1.0"
   platform:
     dependency: transitive
     description:
       name: platform
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.0"
+    version: "3.0.2"
   plugin_platform_interface:
     dependency: transitive
     description:
       name: plugin_platform_interface
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.1"
   process:
     dependency: transitive
     description:
       name: process
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "4.2.1"
+    version: "4.2.3"
   provider:
     dependency: "direct main"
     description:
@@ -225,28 +267,28 @@ packages:
       name: quiver
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.0"
+    version: "3.0.1"
   shared_preferences:
     dependency: "direct main"
     description:
       name: shared_preferences
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.5"
+    version: "2.0.6"
   shared_preferences_linux:
     dependency: transitive
     description:
       name: shared_preferences_linux
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.2"
   shared_preferences_macos:
     dependency: transitive
     description:
       name: shared_preferences_macos
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.2"
   shared_preferences_platform_interface:
     dependency: transitive
     description:
@@ -260,14 +302,14 @@ packages:
       name: shared_preferences_web
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.1"
   shared_preferences_windows:
     dependency: transitive
     description:
       name: shared_preferences_windows
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.0"
+    version: "2.0.2"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -279,7 +321,7 @@ packages:
       name: source_span
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "1.8.0"
+    version: "1.8.1"
   stack_trace:
     dependency: transitive
     description:
@@ -314,7 +356,7 @@ packages:
       name: test_api
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "0.2.19"
+    version: "0.3.0"
   tuple:
     dependency: "direct main"
     description:
@@ -329,6 +371,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
+  uuid:
+    dependency: transitive
+    description:
+      name: uuid
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.0.4"
   vector_math:
     dependency: transitive
     description:
@@ -342,7 +391,7 @@ packages:
       name: win32
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "2.0.5"
+    version: "2.2.5"
   xdg_directories:
     dependency: transitive
     description:
@@ -356,7 +405,7 @@ packages:
       name: xml
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "5.0.2"
+    version: "5.1.2"
   yaml:
     dependency: transitive
     description:
@@ -365,5 +414,5 @@ packages:
     source: hosted
     version: "3.1.0"
 sdks:
-  dart: ">=2.12.0 <3.0.0"
-  flutter: ">=1.20.0"
+  dart: ">=2.13.0 <3.0.0"
+  flutter: ">=2.0.0"
diff --git a/pubspec.yaml b/pubspec.yaml
index 6d97bb3..1207b16 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -27,7 +27,7 @@ dependencies:
   provider: ^5.0.0
   # json_annotation: ^4.0.0
   shared_preferences: ^2.0.5
-  audioplayers: any
+  audioplayers: ^0.19.0
   page_transition: "^1.1.7+6"
   async: any