diff --git a/app/build.gradle b/app/build.gradle
index 335d9cc..609f0dc 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -4,21 +4,22 @@ apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion 30
-    buildToolsVersion "30.0.1"
+    buildToolsVersion "30.0.2"
 
     defaultConfig {
         applicationId "me.zobrist.tichucounter"
         minSdkVersion 16
         targetSdkVersion 30
-        versionCode 1
-        versionName "1.0"
+        versionCode 7
+        versionName "1.0.0"
 
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
     }
 
     buildTypes {
         release {
-            minifyEnabled false
+            minifyEnabled true
+            shrinkResources true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
     }
@@ -37,11 +38,14 @@ dependencies {
     implementation 'androidx.core:core-ktx:1.3.1'
     implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.material:material:1.2.0'
-    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
+    implementation 'com.google.android.play:core:1.8.0'
+    implementation 'com.google.android.play:core-ktx:1.8.1'
+    implementation 'com.google.code.gson:gson:2.8.5'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.1'
     implementation 'androidx.navigation:navigation-fragment-ktx:2.3.0'
     implementation 'androidx.navigation:navigation-ui-ktx:2.3.0'
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.2'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
 
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index d7ced19..e35f381 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -8,7 +8,8 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme">
+        android:theme="@style/AppTheme"
+        android:fullBackupContent="@xml/backup_descriptor">
         <activity
             android:name=".MainActivity"
             android:windowSoftInputMode="adjustPan"
diff --git a/app/src/main/java/me/zobrist/tichucounter/History.kt b/app/src/main/java/me/zobrist/tichucounter/History.kt
index 9f2cd3a..15da7af 100644
--- a/app/src/main/java/me/zobrist/tichucounter/History.kt
+++ b/app/src/main/java/me/zobrist/tichucounter/History.kt
@@ -2,16 +2,10 @@
 
 package me.zobrist.tichucounter
 
-import android.os.Parcel
-import android.os.Parcelable
 
-class History() : Parcelable {
+class History {
     private var scores: ArrayList<Round> = ArrayList()
 
-    constructor(parcel: Parcel) : this() {
-        scores = parcel.readSerializable() as ArrayList<Round>
-    }
-
     fun getScoreA(): Int {
         var tempScore = 0
         scores.forEach {
@@ -31,7 +25,7 @@ class History() : Parcelable {
     fun getHistoryA(): String {
         var tempHistory = String()
         scores.forEach {
-            tempHistory = tempHistory.plus(it.scoreA.toString()).plus("\n")
+            tempHistory += it.scoreA.toString() + "\n"
         }
         return tempHistory
     }
@@ -39,7 +33,7 @@ class History() : Parcelable {
     fun getHistoryB(): String {
         var tempHistory = String()
         scores.forEach {
-            tempHistory = tempHistory.plus(it.scoreB.toString()).plus("\n")
+            tempHistory += it.scoreB.toString() + "\n"
         }
         return tempHistory
     }
@@ -61,23 +55,4 @@ class History() : Parcelable {
     fun isEmpty(): Boolean {
         return scores.isEmpty()
     }
-
-    override fun writeToParcel(parcel: Parcel, flags: Int) {
-        parcel.writeSerializable(scores)
-    }
-
-    override fun describeContents(): Int {
-        return 0
-    }
-
-    companion object CREATOR : Parcelable.Creator<History> {
-        override fun createFromParcel(parcel: Parcel): History {
-            return History(parcel)
-        }
-
-        override fun newArray(size: Int): Array<History?> {
-            return arrayOfNulls(size)
-        }
-    }
-
 }
\ No newline at end of file
diff --git a/app/src/main/java/me/zobrist/tichucounter/MainActivity.kt b/app/src/main/java/me/zobrist/tichucounter/MainActivity.kt
index 7da4264..4a8f94e 100644
--- a/app/src/main/java/me/zobrist/tichucounter/MainActivity.kt
+++ b/app/src/main/java/me/zobrist/tichucounter/MainActivity.kt
@@ -6,17 +6,17 @@ import android.os.Bundle
 import android.text.InputType
 import android.view.Menu
 import android.view.MenuItem
+import android.view.WindowManager
+import android.view.inputmethod.InputMethodManager
 import android.widget.ScrollView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.core.widget.doOnTextChanged
+import com.google.gson.Gson
 import kotlinx.android.synthetic.main.content_main.*
 
 class MainActivity : AppCompatActivity() {
 
-    private var invertA: Boolean = false
-    private var invertB: Boolean = false
-
     private var updateOnChange: Boolean = true
 
     private lateinit var history: History
@@ -31,11 +31,30 @@ class MainActivity : AppCompatActivity() {
         inputTeamA.requestFocus()
         disableSubmitButton()
         updateTheme(this.getSharedPreferences("Settings", Context.MODE_PRIVATE).getInt("Theme", 2))
+        keepScreenOn(
+            this.getSharedPreferences("Settings", Context.MODE_PRIVATE)
+                .getBoolean("Screen_On", false)
+        )
 
-        history = savedInstanceState?.getParcelable("history") ?: History()
+        val json = this.getSharedPreferences("Settings", Context.MODE_PRIVATE).getString("history", "{\"scores\":[]}")
+        history = Gson().fromJson(json, History::class.java)
+        nameTeamA.setText(this.getSharedPreferences("Settings", Context.MODE_PRIVATE).getString("nameTeamA", "TeamA"))
+        nameTeamB.setText(this.getSharedPreferences("Settings", Context.MODE_PRIVATE).getString("nameTeamB", "TeamB"))
         updateView()
 
 
+        inputTeamA.setOnFocusChangeListener { view, b ->
+            if (b) {
+                hideKeyboard()
+            }
+        }
+
+        inputTeamB.setOnFocusChangeListener { view, b ->
+            if (b) {
+                hideKeyboard()
+            }
+        }
+
         inputTeamA.doOnTextChanged { text, start, count, after ->
             if (inputTeamA.isFocused) {
                 if (inputTeamA.text.isNotEmpty()) {
@@ -44,21 +63,21 @@ class MainActivity : AppCompatActivity() {
                             Round(text.toString().toInt(), true)
 
                         } catch (e: java.lang.Exception) {
-                            Round(0, 0)
+                            Round(1, 1)
                         }
                         inputTeamB.setText(currentRound.scoreB.toString())
-                    }else{
+                    } else {
                         updateOnChange = true
                     }
-                }else{
+                } else {
                     inputTeamA.text.clear()
                     inputTeamB.text.clear()
                 }
             }
 
-            if(currentRound.isValidRound()){
+            if (currentRound.isValidRound() && inputTeamA.text.isNotEmpty() && inputTeamB.text.isNotEmpty()) {
                 enableSubmitButton()
-            }else{
+            } else {
                 disableSubmitButton()
             }
         }
@@ -67,80 +86,89 @@ class MainActivity : AppCompatActivity() {
 
         inputTeamB.doOnTextChanged { text, start, count, after ->
             if (inputTeamB.isFocused) {
-                if (inputTeamB.text.isNotEmpty()){
-                    if(updateOnChange){
+                if (inputTeamB.text.isNotEmpty()) {
+                    if (updateOnChange) {
                         currentRound = try {
                             Round(text.toString().toInt(), false)
 
-                        } catch (e: java.lang.Exception){
-                            Round(0, 0)
+                        } catch (e: java.lang.Exception) {
+                            Round(1, 1)
                         }
                         inputTeamA.setText(currentRound.scoreA.toString())
 
-                    }else{
+                    } else {
                         updateOnChange = true
                     }
 
-                }else{
+                } else {
                     inputTeamA.text.clear()
                     inputTeamB.text.clear()
                 }
             }
 
-            if(currentRound.isValidRound()){
+            if (currentRound.isValidRound() && inputTeamA.text.isNotEmpty() && inputTeamB.text.isNotEmpty()) {
                 enableSubmitButton()
-            }else{
+            } else {
                 disableSubmitButton()
             }
         }
 
         buttonAdd100.setOnClickListener {
+            giveFocusToAIfNone()
+
             if (inputTeamA.isFocused) {
 
-                val temp = try {
+                currentRound.scoreA = try {
                     inputTeamA.text.toString().toInt() + 100
                 } catch (e: Exception) {
-                    inputTeamB.setText(0.toString())
+                    currentRound.scoreB = 0
+                    inputTeamB.setText(currentRound.scoreB.toString())
                     100
-
                 }
                 updateOnChange = false
-                inputTeamA.setText(temp.toString())
+                inputTeamA.setText(currentRound.scoreA.toString())
             }
 
             if (inputTeamB.isFocused) {
-                val temp = try {
+                currentRound.scoreB = try {
                     inputTeamB.text.toString().toInt() + 100
                 } catch (e: Exception) {
-                    inputTeamA.setText(0.toString())
+                    currentRound.scoreA = 0
+                    inputTeamA.setText(currentRound.scoreA.toString())
                     100
 
                 }
                 updateOnChange = false
-                inputTeamB.setText(temp.toString())
+                inputTeamB.setText(currentRound.scoreB.toString())
+
             }
         }
 
         buttonSub100.setOnClickListener {
+            giveFocusToAIfNone()
+
             if (inputTeamA.isFocused) {
-                val temp = try {
+                currentRound.scoreA = try {
                     inputTeamA.text.toString().toInt() - 100
                 } catch (e: Exception) {
+                    currentRound.scoreB = 0
+                    inputTeamB.setText(currentRound.scoreB.toString())
                     -100
                 }
                 updateOnChange = false
-                inputTeamA.setText(temp.toString())
-
+                inputTeamA.setText(currentRound.scoreA.toString())
             }
 
             if (inputTeamB.isFocused) {
-                val temp = try {
+                currentRound.scoreB = try {
                     inputTeamB.text.toString().toInt() - 100
                 } catch (e: Exception) {
+                    currentRound.scoreA = 0
+                    inputTeamA.setText(currentRound.scoreA.toString())
                     -100
                 }
                 updateOnChange = false
-                inputTeamB.setText(temp.toString())
+                inputTeamB.setText(currentRound.scoreB.toString())
             }
         }
 
@@ -199,23 +227,29 @@ class MainActivity : AppCompatActivity() {
 
             giveFocusToAIfNone()
 
-            if(inputTeamA.isFocused ){
-                if (inputTeamA.text.isNotEmpty()){
+            if (inputTeamA.isFocused) {
+                if (inputTeamA.text.toString().equals("-")) {
+                    inputTeamA.text.clear()
+                } else if (inputTeamA.text.isNotEmpty()) {
                     tempInt = inputTeamA.text.toString().toInt() * -1
                     inputTeamA.setText(tempInt.toString())
-                }else{
-                    invertB = false
-                    invertA = true
+                } else {
+                    updateOnChange = false
+                    appendToFocusedInput('-')
+                    currentRound = Round(1,1)
                 }
 
 
-            }else if(inputTeamB.isFocused) {
-                if(inputTeamB.text.isNotEmpty()){
+            } else if (inputTeamB.isFocused) {
+                if (inputTeamB.text.toString().equals("-")) {
+                    inputTeamB.text.clear()
+                } else if (inputTeamB.text.isNotEmpty()) {
                     tempInt = inputTeamB.text.toString().toInt() * -1
                     inputTeamB.setText(tempInt.toString())
-                } else{
-                    invertA = false
-                    invertB = true
+                } else {
+                    updateOnChange = false
+                    appendToFocusedInput('-')
+                    currentRound = Round(1,1)
                 }
             }
         }
@@ -242,36 +276,62 @@ class MainActivity : AppCompatActivity() {
 
             if (inputTeamA.text.isNotEmpty() && inputTeamB.text.isNotEmpty()) {
 
-                history.logRound(Round(inputTeamA.text.toString().toInt(), inputTeamB.text.toString().toInt()))
-
+                history.logRound(
+                    Round(
+                        inputTeamA.text.toString().toInt(),
+                        inputTeamB.text.toString().toInt()
+                    )
+                )
 
                 updateView()
 
-
                 inputTeamA.text.clear()
                 inputTeamB.text.clear()
+                disableSubmitButton()
 
                 scrollViewHistory.fullScroll(ScrollView.FOCUS_DOWN)
-
             }
         }
     }
 
     override fun onSaveInstanceState(outState: Bundle) {
         super.onSaveInstanceState(outState)
-        outState.putParcelable("history", history)
+
+        val prefs = this.getSharedPreferences("Settings", Context.MODE_PRIVATE).edit()
+        prefs.putString("history", Gson().toJson(history))
+        prefs.putString("nameTeamA", nameTeamA.text.toString())
+        prefs.putString("nameTeamB", nameTeamB.text.toString())
+        prefs.apply()
+
     }
 
     override fun onCreateOptionsMenu(menu: Menu): Boolean {
         // Inflate the menu; this adds items to the action bar if it is present.
         menuInflater.inflate(R.menu.menu_main, menu)
+
+        menu.findItem(R.id.action_screenOn).isChecked =
+            this.getSharedPreferences("Settings", Context.MODE_PRIVATE)
+                .getBoolean("Screen_On", false)
         return true
     }
 
+
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         return when (item.itemId) {
             R.id.action_clear -> {
-                clearAll()
+                val builder = AlertDialog.Builder(this)
+                builder.setMessage(getString(R.string.confirmClear))
+                    .setTitle(R.string.clear)
+                    .setCancelable(false)
+                    .setPositiveButton(getString(R.string.yes)) { dialog, id ->
+                        dialog.dismiss()
+                        clearAll()
+                    }
+                    .setNegativeButton(getString(R.string.no)) { dialog, id ->
+                        dialog.cancel()
+                    }
+
+                builder.create().show()
                 true
             }
             R.id.action_undo -> {
@@ -282,10 +342,21 @@ class MainActivity : AppCompatActivity() {
                 chooseThemeDialog()
                 true
             }
+            R.id.action_screenOn -> {
+                item.isChecked = !item.isChecked
+                keepScreenOn(item.isChecked)
+                true
+            }
             else -> super.onOptionsItemSelected(item)
         }
     }
 
+    private fun hideKeyboard() {
+        val imm: InputMethodManager =
+            getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
+        imm.hideSoftInputFromWindow(currentFocus!!.windowToken, 0)
+    }
+
     private fun giveFocusToAIfNone() {
         if (!inputTeamA.isFocused && !inputTeamB.isFocused) {
             inputTeamA.requestFocus()
@@ -293,10 +364,8 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun undoLastRound() {
-
         history.revertLastRound()
         updateView()
-
     }
 
     private fun updateView() {
@@ -318,24 +387,12 @@ class MainActivity : AppCompatActivity() {
         history.clearAll()
     }
 
-    private fun appendToFocusedInput(toAppend: Char){
-        if(inputTeamA.isFocused){
-            if(invertA){
-                invertA = false
-                inputTeamA.text.append('-')
-            }
-
+    private fun appendToFocusedInput(toAppend: Char) {
+        if (inputTeamA.isFocused) {
             inputTeamA.text.append(toAppend)
-        }else if(inputTeamB.isFocused)
-        {
-            if(invertB){
-                invertB = false
-                inputTeamB.text.append('-')
-            }
+        } else if (inputTeamB.isFocused) {
             inputTeamB.text.append(toAppend)
         }
-
-
     }
 
     private fun enableSubmitButton() {
@@ -343,7 +400,7 @@ class MainActivity : AppCompatActivity() {
         submit.isEnabled = true
     }
 
-    private fun disableSubmitButton(){
+    private fun disableSubmitButton() {
         submit.imageAlpha = 60 // 0 being transparent and 255 being opaque
         submit.isEnabled = false
     }
@@ -352,9 +409,10 @@ class MainActivity : AppCompatActivity() {
 
         val builder = AlertDialog.Builder(this)
         builder.setTitle(getString(R.string.choose_theme_text))
-        val styles = arrayOf("Light","Dark","System default")
+        val styles = arrayOf("Light", "Dark", "System default")
 
-        val checkedItem = this.getSharedPreferences("", Context.MODE_PRIVATE).getInt("Theme", 2)
+        val checkedItem =
+            this.getSharedPreferences("Settings", Context.MODE_PRIVATE).getInt("Theme", 2)
 
         val prefs = this.getSharedPreferences("Settings", Context.MODE_PRIVATE).edit()
 
@@ -381,4 +439,16 @@ class MainActivity : AppCompatActivity() {
         }
         delegate.applyDayNight()
     }
+
+    private fun keepScreenOn(keepOn: Boolean) {
+        if (keepOn) {
+            window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        } else {
+            window.clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON)
+        }
+
+        val prefs = this.getSharedPreferences("Settings", Context.MODE_PRIVATE).edit()
+        prefs.putBoolean("Screen_On", keepOn)
+        prefs.apply()
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/me/zobrist/tichucounter/Round.kt b/app/src/main/java/me/zobrist/tichucounter/Round.kt
index fad6b61..3f0b7f6 100644
--- a/app/src/main/java/me/zobrist/tichucounter/Round.kt
+++ b/app/src/main/java/me/zobrist/tichucounter/Round.kt
@@ -1,6 +1,8 @@
 package me.zobrist.tichucounter
 
-class Round() {
+import java.io.Serializable
+
+class Round() : Serializable {
     var scoreA: Int = 0
     var scoreB: Int = 0
 
diff --git a/app/src/main/res/layout-land/content_main.xml b/app/src/main/res/layout-land/content_main.xml
index de790fa..a205dec 100644
--- a/app/src/main/res/layout-land/content_main.xml
+++ b/app/src/main/res/layout-land/content_main.xml
@@ -17,13 +17,13 @@
         app:layout_constraintTop_toTopOf="parent">
 
         <LinearLayout
-            android:id="@+id/Names"
+            android:id="@+id/viewNames"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
 
             <EditText
-                android:id="@+id/NameTeamA"
+                android:id="@+id/nameTeamA"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_weight="1"
@@ -34,10 +34,10 @@
                 android:selectAllOnFocus="true"
                 android:singleLine="true"
                 android:text="@string/team_a"
-                android:textAppearance="@style/TextAppearance.AppCompat.Display1" />
+                android:textAppearance="@style/TextAppearance.AppCompat.Large" />
 
             <EditText
-                android:id="@+id/NameTeamB"
+                android:id="@+id/nameTeamB"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
                 android:layout_weight="1"
@@ -48,12 +48,12 @@
                 android:selectAllOnFocus="true"
                 android:singleLine="true"
                 android:text="@string/team_b"
-                android:textAppearance="@style/TextAppearance.AppCompat.Display1" />
+                android:textAppearance="@style/TextAppearance.AppCompat.Large" />
 
         </LinearLayout>
 
         <LinearLayout
-            android:id="@+id/Score"
+            android:id="@+id/viewScore"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
@@ -66,7 +66,8 @@
                 android:gravity="center"
                 android:text="0"
                 android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-                android:textSize="18sp" />
+                android:textSize="18sp"
+                android:textStyle="bold" />
 
             <TextView
                 android:id="@+id/scoreB"
@@ -76,7 +77,8 @@
                 android:gravity="center"
                 android:text="0"
                 android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-                android:textSize="18sp" />
+                android:textSize="18sp"
+                android:textStyle="bold" />
 
         </LinearLayout>
 
@@ -84,7 +86,8 @@
             android:id="@+id/scrollViewHistory"
             android:layout_width="match_parent"
             android:layout_height="match_parent"
-            android:layout_marginTop="16dp">
+            android:layout_marginTop="16dp"
+            android:clickable="false">
 
             <LinearLayout
                 android:layout_width="match_parent"
@@ -121,7 +124,7 @@
         app:layout_constraintStart_toEndOf="@+id/left">
 
         <LinearLayout
-            android:id="@+id/Input"
+            android:id="@+id/viewInput"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:orientation="horizontal">
@@ -270,7 +273,8 @@
                 android:paddingTop="15dp"
                 android:paddingBottom="15dp"
                 android:scaleType="fitCenter"
-                app:srcCompat="@drawable/back" />
+                app:srcCompat="@drawable/back"
+                android:contentDescription="TODO" />
 
         </LinearLayout>
 
@@ -309,7 +313,8 @@
                 android:layout_height="match_parent"
                 android:layout_weight="1.0"
                 android:scaleType="fitCenter"
-                app:srcCompat="@drawable/checkmark" />
+                app:srcCompat="@drawable/checkmark"
+                android:contentDescription="TODO" />
         </LinearLayout>
     </LinearLayout>
 
diff --git a/app/src/main/res/layout/content_main.xml b/app/src/main/res/layout/content_main.xml
index c014338..4b36db1 100644
--- a/app/src/main/res/layout/content_main.xml
+++ b/app/src/main/res/layout/content_main.xml
@@ -7,14 +7,14 @@
     app:layout_behavior="@string/appbar_scrolling_view_behavior">
 
     <LinearLayout
-        android:id="@+id/Names"
+        android:id="@+id/viewNames"
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:orientation="horizontal"
         app:layout_constraintTop_toTopOf="parent">
 
         <EditText
-            android:id="@+id/NameTeamA"
+            android:id="@+id/nameTeamA"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
@@ -25,30 +25,30 @@
             android:selectAllOnFocus="true"
             android:singleLine="true"
             android:text="@string/team_a"
-            android:textAppearance="@style/TextAppearance.AppCompat.Display1" />
+            android:textAppearance="@style/TextAppearance.AppCompat.Large" />
 
         <EditText
-            android:id="@+id/NameTeamB"
-            android:imeOptions="actionDone"
+            android:id="@+id/nameTeamB"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:layout_weight="1"
             android:autofillHints=""
             android:gravity="center"
+            android:imeOptions="actionDone"
             android:inputType="text"
             android:selectAllOnFocus="true"
             android:singleLine="true"
             android:text="@string/team_b"
-            android:textAppearance="@style/TextAppearance.AppCompat.Display1" />
+            android:textAppearance="@style/TextAppearance.AppCompat.Large" />
 
     </LinearLayout>
 
     <LinearLayout
-        android:id="@+id/Score"
+        android:id="@+id/viewScore"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:orientation="horizontal"
-        app:layout_constraintTop_toBottomOf="@+id/Names">
+        app:layout_constraintTop_toBottomOf="@+id/viewNames">
 
         <TextView
             android:id="@+id/scoreA"
@@ -58,7 +58,8 @@
             android:gravity="center"
             android:text="0"
             android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-            android:textSize="18sp" />
+            android:textSize="18sp"
+            android:textStyle="bold" />
 
         <TextView
             android:id="@+id/scoreB"
@@ -68,7 +69,8 @@
             android:gravity="center"
             android:text="0"
             android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-            android:textSize="18sp" />
+            android:textSize="18sp"
+            android:textStyle="bold" />
 
     </LinearLayout>
 
@@ -84,8 +86,8 @@
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_marginTop="16dp"
-        app:layout_constraintBottom_toTopOf="@+id/Input"
-        app:layout_constraintTop_toBottomOf="@+id/Score">
+        app:layout_constraintBottom_toTopOf="@+id/viewInput"
+        app:layout_constraintTop_toBottomOf="@+id/viewScore">
 
         <LinearLayout
             android:layout_width="match_parent"
@@ -116,10 +118,10 @@
         android:layout_width="match_parent"
         android:layout_height="1dp"
         android:background="?android:attr/listDivider"
-        app:layout_constraintBottom_toBottomOf="@+id/Score" />
+        app:layout_constraintBottom_toBottomOf="@+id/viewScore" />
 
     <LinearLayout
-        android:id="@+id/Input"
+        android:id="@+id/viewInput"
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:orientation="horizontal"
@@ -272,7 +274,8 @@
             android:paddingTop="15dp"
             android:paddingBottom="15dp"
             android:scaleType="fitCenter"
-            app:srcCompat="@drawable/back" />
+            app:srcCompat="@drawable/back"
+            android:contentDescription="TODO" />
 
     </LinearLayout>
 
@@ -314,6 +317,7 @@
             android:layout_height="match_parent"
             android:layout_weight="1.0"
             android:scaleType="fitCenter"
-            app:srcCompat="@drawable/checkmark" />
+            app:srcCompat="@drawable/checkmark"
+            android:contentDescription="TODO" />
     </LinearLayout>
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/menu/menu_main.xml b/app/src/main/res/menu/menu_main.xml
index 779bead..dd7f051 100644
--- a/app/src/main/res/menu/menu_main.xml
+++ b/app/src/main/res/menu/menu_main.xml
@@ -17,4 +17,9 @@
         android:id="@+id/action_theme"
         android:orderInCategory="15"
         android:title="@string/choose_theme_text" />
+    <item
+        android:id="@+id/action_screenOn"
+        android:checkable="true"
+        android:orderInCategory="20"
+        android:title="@string/keep_screen_on" />
 </menu>
\ No newline at end of file
diff --git a/app/src/main/res/values-de/strings.xml b/app/src/main/res/values-de/strings.xml
index 560610f..aa8ffe5 100644
--- a/app/src/main/res/values-de/strings.xml
+++ b/app/src/main/res/values-de/strings.xml
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="clear">Neues Spiel Starten</string>
-    <string name="undo">Letzte Runde Löschen</string>
+    <string name="clear">Neues Spiel starten</string>
+    <string name="undo">Letzte Runde löschen</string>
     <string name="choose_theme_text">Theme auswählen</string>
+    <string name="keep_screen_on">Bildschirm eingeschaltet lassen</string>
+    <string name="confirmClear">Möchten Sie das laufende Spiel wirklich löschen?</string>
+    <string name="yes">Ja</string>
+    <string name="no">Nein</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values-gsw-rCH/strings.xml b/app/src/main/res/values-gsw-rCH/strings.xml
index c8d4afd..3559d30 100644
--- a/app/src/main/res/values-gsw-rCH/strings.xml
+++ b/app/src/main/res/values-gsw-rCH/strings.xml
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="clear">Neus Spil Starte</string>
-    <string name="undo">Letschti Rundi Lösche</string>
+    <string name="clear">Neus Spil starte</string>
+    <string name="undo">Letschti Rundi lösche</string>
     <string name="choose_theme_text">Usgsehe ändere</string>
+    <string name="keep_screen_on">Bildschirm igschalted la</string>
+    <string name="confirmClear">Wosch ds loufende Spil würklech lösche?</string>
+    <string name="yes">Ja</string>
+    <string name="no">Nei</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0e770fb..0944156 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -4,7 +4,11 @@
 
     <string name="team_a" translatable="false">Team A</string>
     <string name="team_b" translatable="false">Team B</string>
-    <string name="clear">Start New Game</string>
-    <string name="undo">Undo Last Round</string>
+    <string name="clear">Start new game</string>
+    <string name="undo">Undo last round</string>
     <string name="choose_theme_text">Choose theme</string>
+    <string name="keep_screen_on">Keep screen on</string>
+    <string name="confirmClear">Do you really want to delete the current game?</string>
+    <string name="yes">Yes</string>
+    <string name="no">No</string>
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/xml/backup_descriptor.xml b/app/src/main/res/xml/backup_descriptor.xml
new file mode 100644
index 0000000..6fd6103
--- /dev/null
+++ b/app/src/main/res/xml/backup_descriptor.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<full-backup-content>
+    <!-- Exclude specific shared preferences that contain GCM registration Id -->
+</full-backup-content>
diff --git a/build.gradle b/build.gradle
index 1241d12..33d6ece 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.3.72"
+    ext.kotlin_version = "1.4.10"
     repositories {
         google()
         jcenter()