diff --git a/app/src/main/res/drawable/ic_circle_blue_36dp.xml b/app/src/main/res/drawable/ic_circle_blue_36dp.xml
index 869ae06..5cfcc8e 100644
--- a/app/src/main/res/drawable/ic_circle_blue_36dp.xml
+++ b/app/src/main/res/drawable/ic_circle_blue_36dp.xml
@@ -1,6 +1,6 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="35dp"
-    android:height="35dp"
+    android:width="37dp"
+    android:height="37dp"
     android:viewportWidth="24.0"
     android:viewportHeight="24.0">
     <path
diff --git a/app/src/main/res/drawable/ic_circle_grey_36dp.xml b/app/src/main/res/drawable/ic_circle_grey_36dp.xml
index 75156d0..b2962e0 100644
--- a/app/src/main/res/drawable/ic_circle_grey_36dp.xml
+++ b/app/src/main/res/drawable/ic_circle_grey_36dp.xml
@@ -1,6 +1,6 @@
 <vector xmlns:android="http://schemas.android.com/apk/res/android"
-    android:width="35dp"
-    android:height="35dp"
+    android:width="37dp"
+    android:height="37dp"
     android:viewportWidth="24.0"
     android:viewportHeight="24.0">
     <path
diff --git a/app/src/main/res/layout-land/activity_daily_sudoku.xml b/app/src/main/res/layout-land/activity_daily_sudoku.xml
index bfd640c..5dcfe0c 100644
--- a/app/src/main/res/layout-land/activity_daily_sudoku.xml
+++ b/app/src/main/res/layout-land/activity_daily_sudoku.xml
@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
-
 <androidx.drawerlayout.widget.DrawerLayout android:id="@+id/drawer_layout_main"
     android:layout_height="match_parent"
     android:layout_width="match_parent"
@@ -24,8 +23,7 @@
             app:layout_constraintBottom_toBottomOf="parent"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="parent"
-            tools:layout_editor_absoluteY="433dp">
+            app:layout_constraintTop_toBottomOf="parent">
 
         </androidx.viewpager.widget.ViewPager>
 
@@ -76,7 +74,6 @@
             android:id="@+id/floatingActionButton"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:layout_marginTop="128dp"
             android:layout_marginBottom="8dp"
             android:clickable="true"
             android:onClick="onClick"
@@ -88,150 +85,144 @@
             app:layout_constraintVertical_bias="1.0"
             app:srcCompat="@android:drawable/ic_media_play" />
 
-        <androidx.constraintlayout.widget.ConstraintLayout
-            android:id="@+id/linearLayout11"
-            android:layout_width="0dp"
+        <ImageView
+            android:id="@+id/statistic_image"
+            android:layout_width="wrap_content"
+            android:layout_height="0dp"
+            android:layout_marginStart="16dp"
+            android:layout_marginLeft="16dp"
+            android:layout_marginTop="16dp"
+            android:layout_marginBottom="8dp"
+            android:adjustViewBounds="true"
+            android:src="@drawable/icon_default_9x9"
+            app:layout_constraintBottom_toTopOf="@+id/view3"
+            app:layout_constraintEnd_toStartOf="@id/view"
+            app:layout_constraintHorizontal_bias="0.0"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@+id/appbar" />
+
+
+        <TextView
+            android:id="@+id/first_diff_text"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:gravity="center|center_horizontal"
+            android:text="diffi"
+            android:textSize="22sp"
+            app:layout_constraintBottom_toTopOf="@+id/first_diff_bar"
+            app:layout_constraintEnd_toEndOf="@+id/first_diff_bar"
+            app:layout_constraintStart_toStartOf="@+id/first_diff_bar"
+            app:layout_constraintTop_toTopOf="@+id/statistic_image"
+            app:layout_constraintVertical_bias="1.0" />
+
+        <RatingBar
+            android:id="@+id/first_diff_bar"
+            style="?android:attr/ratingBarStyleSmall"
+
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+
+            android:layout_marginStart="8dp"
+            android:layout_marginLeft="8dp"
+            android:layout_marginEnd="8dp"
+            android:layout_marginRight="8dp"
+            android:numStars="4"
+            android:scaleX="1.5"
+            android:scaleY="1.5"
+            app:layout_constraintBottom_toBottomOf="@+id/statistic_image"
+            app:layout_constraintEnd_toStartOf="@+id/view"
+            app:layout_constraintStart_toEndOf="@+id/statistic_image"
+            app:layout_constraintTop_toTopOf="@+id/statistic_image"
+            app:layout_constraintVertical_bias="0.50" />
+
+
+        <View
+            android:id="@+id/view"
+            android:layout_width="1dp"
             android:layout_height="0dp"
             android:layout_marginTop="16dp"
             android:layout_marginBottom="8dp"
-            android:weightSum="5"
+            android:background="?attr/colorPrimary"
+            android:foregroundGravity="center_vertical"
             app:layout_constraintBottom_toTopOf="@+id/view3"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
-            app:layout_constraintTop_toBottomOf="@+id/appbar">
+            app:layout_constraintTop_toBottomOf="@+id/appbar" />
 
 
-            <ImageView
-                android:id="@+id/statistic_image"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_marginStart="16dp"
-                android:layout_marginLeft="16dp"
-                android:adjustViewBounds="true"
-                android:src="@drawable/icon_default_9x9"
-                app:layout_constraintBottom_toBottomOf="parent"
-                app:layout_constraintEnd_toStartOf="@id/view"
-                app:layout_constraintHorizontal_bias="0.0"
-                app:layout_constraintStart_toStartOf="parent"
-                app:layout_constraintTop_toTopOf="parent" />
+        <TextView
+            android:id="@+id/textView4"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/daily_number_of_hints"
+            app:layout_constraintBottom_toBottomOf="parent"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintHorizontal_bias="0.25"
+            app:layout_constraintStart_toStartOf="@id/view"
+            app:layout_constraintTop_toTopOf="@+id/statistic_image"
+            app:layout_constraintVertical_bias="0.0" />
 
+        <TextView
+            android:id="@+id/numb_of_hints"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="0"
+            app:layout_constraintBottom_toBottomOf="@+id/textView4"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toEndOf="@+id/textView4"
+            app:layout_constraintTop_toTopOf="@+id/textView4" />
 
-            <TextView
-                android:id="@+id/first_diff_text"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:gravity="center|center_horizontal"
-                android:text="diffi"
-                android:textSize="22sp"
-                app:layout_constraintBottom_toTopOf="@+id/first_diff_bar"
-                app:layout_constraintEnd_toEndOf="@+id/first_diff_bar"
-                app:layout_constraintStart_toStartOf="@+id/first_diff_bar"
-                app:layout_constraintTop_toTopOf="@+id/statistic_image"
-                app:layout_constraintVertical_bias="1.0" />
+        <TextView
+            android:id="@+id/textView5"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/number_of_completed_games"
 
-            <RatingBar
-                android:id="@+id/first_diff_bar"
-                style="?android:attr/ratingBarStyleSmall"
+            android:layout_marginBottom="8dp"
+            app:layout_constraintBottom_toTopOf="@+id/view3"
+            app:layout_constraintEnd_toEndOf="@+id/textView4"
+            app:layout_constraintHorizontal_bias="0.0"
+            app:layout_constraintStart_toStartOf="@+id/textView4"
+            app:layout_constraintTop_toBottomOf="@+id/textView4"
+            app:layout_constraintVertical_bias="0.0" />
 
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
+        <TextView
+            android:id="@+id/numb_of_total_games"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="0"
+            app:layout_constraintBottom_toBottomOf="@+id/textView5"
+            app:layout_constraintEnd_toEndOf="@+id/numb_of_hints"
+            app:layout_constraintStart_toStartOf="@+id/numb_of_hints"
+            app:layout_constraintTop_toTopOf="@+id/textView5" />
 
-                android:layout_marginStart="8dp"
-                android:layout_marginLeft="8dp"
-                android:layout_marginEnd="8dp"
-                android:layout_marginRight="8dp"
-                android:numStars="4"
-                android:scaleX="1.5"
-                android:scaleY="1.5"
-                app:layout_constraintBottom_toBottomOf="@+id/statistic_image"
-                app:layout_constraintEnd_toStartOf="@+id/view"
-                app:layout_constraintStart_toEndOf="@+id/statistic_image"
-                app:layout_constraintTop_toTopOf="@+id/statistic_image"
-                app:layout_constraintVertical_bias="0.50" />
+        <TextView
+            android:id="@+id/textView6"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="@string/total_of_time"
 
+            android:layout_marginBottom="8dp"
+            app:layout_constraintBottom_toTopOf="@+id/view3"
+            app:layout_constraintEnd_toEndOf="@+id/textView4"
+            app:layout_constraintHorizontal_bias="0.0"
+            app:layout_constraintStart_toStartOf="@+id/textView4"
+            app:layout_constraintTop_toBottomOf="@+id/textView5"
+            app:layout_constraintVertical_bias="0.0" />
 
-            <View
-                android:id="@+id/view"
-                android:layout_width="1dp"
-                android:layout_height="wrap_content"
-                android:background="?attr/colorPrimary"
-                android:foregroundGravity="center_vertical"
-                app:layout_constraintBottom_toBottomOf="parent"
-                app:layout_constraintLeft_toLeftOf="parent"
-                app:layout_constraintRight_toRightOf="parent"
-                app:layout_constraintTop_toTopOf="parent" />
+        <TextView
+            android:id="@+id/numb_of_total_time"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="0"
 
-
-            <TextView
-                android:id="@+id/textView4"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="@string/daily_number_of_hints"
-                app:layout_constraintBottom_toBottomOf="parent"
-                app:layout_constraintEnd_toEndOf="parent"
-                app:layout_constraintHorizontal_bias="0.25"
-                app:layout_constraintStart_toStartOf="@id/view"
-                app:layout_constraintTop_toTopOf="@+id/statistic_image"
-                app:layout_constraintVertical_bias="0.0" />
-
-            <TextView
-                android:id="@+id/numb_of_hints"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="0"
-                app:layout_constraintBottom_toBottomOf="@+id/textView4"
-                app:layout_constraintEnd_toEndOf="parent"
-                app:layout_constraintStart_toEndOf="@+id/textView4"
-                app:layout_constraintTop_toTopOf="@+id/textView4" />
-
-            <TextView
-                android:id="@+id/textView5"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="@string/number_of_completed_games"
-                app:layout_constraintBottom_toBottomOf="parent"
-                app:layout_constraintEnd_toEndOf="@+id/textView4"
-                app:layout_constraintHorizontal_bias="0.0"
-                app:layout_constraintStart_toStartOf="@+id/textView4"
-                app:layout_constraintTop_toBottomOf="@+id/textView4"
-                app:layout_constraintVertical_bias="0.0" />
-
-            <TextView
-                android:id="@+id/numb_of_total_games"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="0"
-                app:layout_constraintBottom_toBottomOf="@+id/textView5"
-                app:layout_constraintEnd_toEndOf="@+id/numb_of_hints"
-                app:layout_constraintStart_toStartOf="@+id/numb_of_hints"
-                app:layout_constraintTop_toTopOf="@+id/textView5" />
-
-            <TextView
-                android:id="@+id/textView6"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="@string/total_of_time"
-                app:layout_constraintBottom_toBottomOf="parent"
-                app:layout_constraintEnd_toEndOf="@+id/textView4"
-                app:layout_constraintHorizontal_bias="0.0"
-                app:layout_constraintStart_toStartOf="@+id/textView4"
-                app:layout_constraintTop_toBottomOf="@+id/textView5"
-                app:layout_constraintVertical_bias="0.0" />
-
-            <TextView
-                android:id="@+id/numb_of_total_time"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:text="0"
-                app:layout_constraintBottom_toBottomOf="parent"
-                app:layout_constraintEnd_toEndOf="@+id/textView6"
-                app:layout_constraintHorizontal_bias="0.0"
-                app:layout_constraintStart_toStartOf="@+id/textView4"
-                app:layout_constraintTop_toBottomOf="@+id/textView6"
-                app:layout_constraintVertical_bias="0.0" />
-
-
-        </androidx.constraintlayout.widget.ConstraintLayout>
+            android:layout_marginBottom="8dp"
+            app:layout_constraintBottom_toTopOf="@+id/view3"
+            app:layout_constraintEnd_toEndOf="@+id/textView6"
+            app:layout_constraintHorizontal_bias="0.0"
+            app:layout_constraintStart_toStartOf="@+id/textView4"
+            app:layout_constraintTop_toBottomOf="@+id/textView6"
+            app:layout_constraintVertical_bias="0.0" />
 
         <ListView
             android:id="@+id/sudoku_list"
diff --git a/app/src/main/res/layout-land/activity_main_menu.xml b/app/src/main/res/layout-land/activity_main_menu.xml
index 2a8b1c1..3c80fef 100644
--- a/app/src/main/res/layout-land/activity_main_menu.xml
+++ b/app/src/main/res/layout-land/activity_main_menu.xml
@@ -102,30 +102,44 @@
                     android:text="@string/difficulty_easy"
                     android:textSize="@dimen/main_text_difficulty"/>
 
-                <LinearLayout
-                    android:layout_width="wrap_content"
+                <androidx.constraintlayout.widget.ConstraintLayout
+                    android:id="@+id/linearLayout"
+                    android:layout_width="match_parent"
                     android:layout_height="wrap_content"
-                    android:gravity="center_vertical"
-                    android:orientation="horizontal">
+                    android:gravity="center_vertical">
 
                     <CheckBox
                         android:id="@+id/circleButton"
-                        android:layout_width="35dp"
-                        android:layout_height="35dp"
-                        android:button="@drawable/create_game_src" />
+                        style="@style/CheckBox"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginEnd="4dp"
+                        android:layout_marginRight="4dp"
+                        android:button="@drawable/create_game_src"
+                        app:layout_constraintBottom_toBottomOf="parent"
+                        app:layout_constraintEnd_toStartOf="@+id/difficultyBar"
+                        app:layout_constraintHorizontal_bias="1.0"
+                        app:layout_constraintStart_toStartOf="parent"
+                        app:layout_constraintTop_toTopOf="parent"
+                        app:layout_constraintVertical_bias="0.65" />
 
                     <RatingBar
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:id="@+id/difficultyBar"
-                    android:layout_gravity="center_horizontal"
-                    android:clickable="true"
-                    android:numStars="3"
-                    android:rating="1"
-                    android:stepSize="1"
-                    style="@style/RatingBar"/>
+                        android:id="@+id/difficultyBar"
+                        style="@style/RatingBar"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginStart="41dp"
+                        android:layout_marginLeft="41dp"
+                        android:clickable="true"
+                        android:numStars="3"
+                        android:rating="1"
+                        android:stepSize="1"
+                        app:layout_constraintBottom_toBottomOf="parent"
+                        app:layout_constraintEnd_toEndOf="parent"
+                        app:layout_constraintStart_toStartOf="parent"
+                        app:layout_constraintTop_toTopOf="parent" />
 
-                </LinearLayout>
+                </androidx.constraintlayout.widget.ConstraintLayout>
 
                 <Button
                     android:textColor="?attr/lightestFontColor"
diff --git a/app/src/main/res/layout-small/activity_main_menu.xml b/app/src/main/res/layout-small/activity_main_menu.xml
index f91322a..bc4f56e 100644
--- a/app/src/main/res/layout-small/activity_main_menu.xml
+++ b/app/src/main/res/layout-small/activity_main_menu.xml
@@ -104,31 +104,44 @@
                 android:text="@string/difficulty_easy"
                 android:textSize="@dimen/main_text_difficulty"/>
 
-            <LinearLayout
+            <androidx.constraintlayout.widget.ConstraintLayout
+                android:id="@+id/linearLayout3"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:gravity="center_vertical"
-                android:orientation="horizontal">
+                android:gravity="center_vertical">
 
                 <CheckBox
                     android:id="@+id/circleButton"
-                    android:layout_width="35dp"
-                    android:layout_height="35dp"
-                    android:button="@drawable/create_game_src" />
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginEnd="3dp"
+                    android:layout_marginRight="3dp"
+                    android:button="@drawable/create_game_src"
+                    android:scaleX="0.75"
+                    android:scaleY="0.75"
+                    app:layout_constraintBottom_toBottomOf="@+id/difficultyBar"
+                    app:layout_constraintEnd_toStartOf="@+id/difficultyBar"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="@+id/difficultyBar" />
 
-            <RatingBar
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:id="@+id/difficultyBar"
-                android:layout_gravity="center_horizontal"
-                android:clickable="true"
-                android:numStars="3"
-                android:rating="1"
-                android:stepSize="1"
-                android:scaleX="0.75"
-                android:scaleY="0.75"
-                style="@style/RatingBar"/>
-            </LinearLayout>
+                <RatingBar
+                    android:id="@+id/difficultyBar"
+                    style="@style/RatingBar"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="32dp"
+                    android:layout_marginLeft="32dp"
+                    android:clickable="true"
+                    android:numStars="3"
+                    android:rating="1"
+                    android:scaleX="0.75"
+                    android:scaleY="0.75"
+                    android:stepSize="1"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
+            </androidx.constraintlayout.widget.ConstraintLayout>
 
             <Button
                 android:textColor="?attr/lightestFontColor"
diff --git a/app/src/main/res/layout-xlarge/activity_main_menu.xml b/app/src/main/res/layout-xlarge/activity_main_menu.xml
index b4e19ba..efc0bf4 100644
--- a/app/src/main/res/layout-xlarge/activity_main_menu.xml
+++ b/app/src/main/res/layout-xlarge/activity_main_menu.xml
@@ -9,9 +9,6 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
 <androidx.coordinatorlayout.widget.CoordinatorLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:fitsSystemWindows="true"
     tools:context="tu_darmstadt.sudoku.ui.MainActivity"
     android:layout_height="match_parent"
@@ -82,8 +79,7 @@
                 android:onClick="onClick"/>
         </RelativeLayout>
 
-        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-            xmlns:tools="http://schemas.android.com/tools"
+        <LinearLayout
             android:layout_width="match_parent"
             android:layout_height="0dp"
             android:layout_below="@id/scroller"
@@ -107,34 +103,46 @@
                 android:text="@string/difficulty_easy"
                 android:textSize="@dimen/main_text_difficulty"/>
 
-            <LinearLayout
+            <androidx.constraintlayout.widget.ConstraintLayout
+                android:id="@+id/linearLayout2"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
-                android:gravity="center_vertical"
-                android:orientation="horizontal">
+                android:gravity="center_vertical">
 
                 <CheckBox
                     android:id="@+id/circleButton"
-                    android:layout_width="35dp"
-                    android:layout_height="35dp"
-                    android:layout_gravity="center_horizontal"
-                    android:button="@drawable/create_game_src" />
+                    style="@style/CheckBox"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginEnd="4dp"
+                    android:layout_marginRight="4dp"
+                    android:button="@drawable/create_game_src"
+                    app:layout_constraintBottom_toBottomOf="@+id/difficultyBar"
+                    app:layout_constraintEnd_toStartOf="@+id/difficultyBar"
+                    app:layout_constraintHorizontal_bias="1.0"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="@+id/difficultyBar"
+                    app:layout_constraintVertical_bias="0.65" />
 
-            <RatingBar
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:id="@+id/difficultyBar"
-                android:layout_gravity="center_horizontal"
-                android:clickable="true"
-                android:numStars="3"
-                android:rating="1"
-                android:padding="0dp"
-                android:layout_margin="0dp"
-                android:stepSize="1"
-                android:paddingTop="70dp"
-                style="@style/RatingBar"/>
+                <RatingBar
+                    android:id="@+id/difficultyBar"
+                    style="@style/RatingBar"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:layout_marginStart="41dp"
+                    android:layout_marginLeft="41dp"
+                    android:clickable="true"
+                    android:numStars="3"
+                    android:padding="0dp"
+                    android:paddingTop="70dp"
+                    android:rating="1"
+                    android:stepSize="1"
+                    app:layout_constraintBottom_toBottomOf="parent"
+                    app:layout_constraintEnd_toEndOf="parent"
+                    app:layout_constraintStart_toStartOf="parent"
+                    app:layout_constraintTop_toTopOf="parent" />
 
-            </LinearLayout>
+            </androidx.constraintlayout.widget.ConstraintLayout>
             <Button
                 android:textColor="?attr/lightestFontColor"
                 android:layout_width="match_parent"
diff --git a/app/src/main/res/layout/activity_main_menu.xml b/app/src/main/res/layout/activity_main_menu.xml
index be2d892..994640b 100644
--- a/app/src/main/res/layout/activity_main_menu.xml
+++ b/app/src/main/res/layout/activity_main_menu.xml
@@ -9,7 +9,6 @@
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <androidx.coordinatorlayout.widget.CoordinatorLayout
-        xmlns:app="http://schemas.android.com/apk/res-auto"
         android:fitsSystemWindows="true"
         tools:context="tu_darmstadt.sudoku.ui.MainActivity"
         android:layout_height="match_parent"
@@ -80,8 +79,7 @@
                     android:layout_centerVertical="true"
                     android:onClick="onClick"/>
             </RelativeLayout>
-            <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
-                xmlns:tools="http://schemas.android.com/tools"
+            <LinearLayout
                 android:layout_width="match_parent"
                 android:layout_height="0px"
                 android:layout_weight="6"
@@ -103,28 +101,43 @@
                     android:text="@string/difficulty_easy"
                     android:textSize="@dimen/main_text_difficulty"/>
 
-                <LinearLayout
+                <androidx.constraintlayout.widget.ConstraintLayout
                     android:layout_width="wrap_content"
                     android:layout_height="wrap_content"
                     android:gravity="center_vertical"
-                    android:orientation="horizontal">
+                    android:orientation="horizontal"
+                    android:id="@+id/linearLayout4">
 
                     <CheckBox
                         android:id="@+id/circleButton"
-                        android:layout_width="35dp"
-                        android:layout_height="35dp"
-                        android:button="@drawable/create_game_src" />
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content"
+                        android:layout_marginEnd="4dp"
+                        android:layout_marginRight="4dp"
+                        android:layout_marginBottom="7dp"
+                        android:button="@drawable/create_game_src"
+                        app:layout_constraintBottom_toBottomOf="@+id/difficultyBar"
+                        app:layout_constraintEnd_toStartOf="@+id/difficultyBar"
+                        app:layout_constraintStart_toStartOf="parent"
+                        app:layout_constraintTop_toTopOf="@+id/difficultyBar"
+                        app:layout_constraintVertical_bias="0.65" />
 
                     <RatingBar
                         android:id="@+id/difficultyBar"
                         style="@style/RatingBar"
                         android:layout_width="wrap_content"
-                        android:layout_gravity="center_horizontal"
+                        android:layout_height="wrap_content"
+                        android:layout_marginStart="41dp"
+                        android:layout_marginLeft="41dp"
                         android:clickable="true"
                         android:numStars="3"
                         android:rating="0.5"
-                        android:stepSize="1" />
-                </LinearLayout>
+                        android:stepSize="1"
+                        app:layout_constraintBottom_toBottomOf="parent"
+                        app:layout_constraintEnd_toEndOf="parent"
+                        app:layout_constraintStart_toStartOf="parent"
+                        app:layout_constraintTop_toTopOf="parent" />
+                </androidx.constraintlayout.widget.ConstraintLayout>
 
                 <Button
                     android:textColor="?attr/lightestFontColor"