diff --git a/Android/app/build.gradle b/Android/app/build.gradle
index 8968c27..fa8ec02 100644
--- a/Android/app/build.gradle
+++ b/Android/app/build.gradle
@@ -34,7 +34,6 @@ android {
 }
 
 dependencies {
-
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.appcompat:appcompat:1.6.1'
     implementation 'com.google.android.material:material:1.11.0'
diff --git a/Android/app/src/main/AndroidManifest.xml b/Android/app/src/main/AndroidManifest.xml
index c0ca71d..5936808 100644
--- a/Android/app/src/main/AndroidManifest.xml
+++ b/Android/app/src/main/AndroidManifest.xml
@@ -23,5 +23,6 @@
         <activity android:name=".ServerDetailsActivity" />
         <activity android:name=".CreateLobbyActivity" />
         <activity android:name=".ConnexionPlayerActivity" />
+        <activity android:name=".QuizMultiActivity" />
     </application>
 </manifest>
\ No newline at end of file
diff --git a/Android/app/src/main/java/com/example/mathseduc/MainActivity.kt b/Android/app/src/main/java/com/example/mathseduc/MainActivity.kt
index 67d9bf6..1645d32 100644
--- a/Android/app/src/main/java/com/example/mathseduc/MainActivity.kt
+++ b/Android/app/src/main/java/com/example/mathseduc/MainActivity.kt
@@ -22,6 +22,8 @@ class MainActivity : AppCompatActivity() {
         btnSolo.setOnClickListener {
             // Traitement pour le bouton Solo
             // Vous pouvez ajouter le code correspondant ici
+            val intent = Intent(this, QuizMultiActivity::class.java)
+            startActivity(intent)
         }
 
         btnMulti.setOnClickListener {
diff --git a/Android/app/src/main/java/com/example/mathseduc/MultiActivity.kt b/Android/app/src/main/java/com/example/mathseduc/MultiActivity.kt
index 3d68480..e114a92 100644
--- a/Android/app/src/main/java/com/example/mathseduc/MultiActivity.kt
+++ b/Android/app/src/main/java/com/example/mathseduc/MultiActivity.kt
@@ -7,11 +7,9 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.ArrayAdapter
-import android.widget.Button
-import android.widget.ListView
-import android.widget.TextView
+import android.widget.*
 import androidx.appcompat.app.AppCompatActivity
+import com.example.mathseduc.controllers.ControllerChapter
 import com.example.mathseduc.controllers.ControllerLobby
 import com.example.mathseduc.controllers.ControllerUtiliser
 import com.example.mathseduc.models.Lobby
@@ -35,17 +33,22 @@ class MultiActivity : AppCompatActivity() {
             listView.adapter = adapter
 
             listView.setOnItemClickListener { _, _, position, _ ->
-                val formDataBuilder = MultipartBody.Builder().setType(MultipartBody.FORM)
-                formDataBuilder.addFormDataPart("idplayer", MainActivity.idPlayerConnected.toString())
-                formDataBuilder.addFormDataPart("idlobby", serverList[position].id.toString())
-                formDataBuilder.addFormDataPart("playertime", "0")
 
-                ControllerUtiliser.createUtiliserByIdLobby(formDataBuilder)
-
-                val intent = Intent(this, ServerDetailsActivity::class.java)
-                intent.putExtra("serverName", serverList[position].name)
-                intent.putExtra("lobbyId", serverList[position].id)
-                startActivity(intent)
+                if (ControllerLobby.getNbPlayerInLobby(serverList[position].id) < serverList[position].nbplayers){
+                    val formDataBuilder = MultipartBody.Builder().setType(MultipartBody.FORM)
+                    formDataBuilder.addFormDataPart("idplayer", MainActivity.idPlayerConnected.toString())
+                    formDataBuilder.addFormDataPart("idlobby", serverList[position].id.toString())
+                    formDataBuilder.addFormDataPart("playertime", "0")
+
+                    ControllerUtiliser.createUtiliserByIdLobby(formDataBuilder)
+
+                    val intent = Intent(this, ServerDetailsActivity::class.java)
+                    intent.putExtra("serverName", serverList[position].name)
+                    intent.putExtra("lobbyId", serverList[position].id)
+                    startActivity(intent)
+                } else {
+                    Toast.makeText(this, "Oh nan, le serveur est déja plein ! Réessayer plus tard.", Toast.LENGTH_SHORT).show()
+                }
             }
         } else {
             Log.e("MultiActivity", "Error fetching server list")
@@ -97,10 +100,11 @@ class MultiActivity : AppCompatActivity() {
             val difficulty = currentLobbyView!!.findViewById<TextView>(R.id.difficulty)
 
             name.text = mLobbies[position].name
-            nbplayers.text = mLobbies[position].nbplayers.toString()
-            idchapter.text = mLobbies[position].idchapter.toString()
+            nbplayers.text = ControllerLobby.getNbPlayerInLobby(mLobbies[position].id).toString() + "/" + mLobbies[position].nbplayers.toString()
+            idchapter.text = ControllerChapter.getChapterNameById(mLobbies[position].idchapter)
             difficulty.text = mLobbies[position].difficulty.toString()
 
+
             // Visual Feedback for Selection
             /*
             if (selectedItem == position)
diff --git a/Android/app/src/main/java/com/example/mathseduc/QuizMultiActivity.kt b/Android/app/src/main/java/com/example/mathseduc/QuizMultiActivity.kt
new file mode 100644
index 0000000..0404e7b
--- /dev/null
+++ b/Android/app/src/main/java/com/example/mathseduc/QuizMultiActivity.kt
@@ -0,0 +1,64 @@
+package com.example.mathseduc
+
+import android.os.Bundle
+import android.os.CountDownTimer
+import android.widget.Button
+import android.widget.ProgressBar
+import android.widget.Toast
+import androidx.appcompat.app.AppCompatActivity
+
+class QuizMultiActivity : AppCompatActivity() {
+
+    private lateinit var countDownTimer: CountDownTimer
+
+    var progressBarValue : Int = 0
+    var chronoValue : Int = 0
+
+
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_quiz_multi)
+
+        var progressBar1 = findViewById<ProgressBar>(R.id.progressBar1)
+        var chrono = findViewById<ProgressBar>(R.id.chrono)
+
+        progressBar1.max = 100
+        chrono.max = 30
+
+
+
+        var incrementeButton = findViewById<Button>(R.id.buttonValider)
+
+        // Initialiser le CountDownTimer
+        countDownTimer = object : CountDownTimer(30*1000, 1000) {
+            override fun onTick(millisUntilFinished: Long) {
+                // Incrémenter la valeur de la ProgressBar chaque seconde
+                chronoValue++
+                chrono.progress = chronoValue
+                progressBarValue++
+                progressBar1.progress = progressBarValue
+                
+            }
+
+            override fun onFinish() {
+                // Code à exécuter lorsque le timer est terminé
+            }
+        }
+
+        incrementeButton.setOnClickListener {
+            progressBarValue += 10
+            progressBar1.progress = progressBarValue
+        }
+
+        // Démarrer le CountDownTimer
+        countDownTimer.start()
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        // Arrêter le CountDownTimer pour éviter les fuites de mémoire
+        countDownTimer.cancel()
+    }
+
+}
\ No newline at end of file
diff --git a/Android/app/src/main/java/com/example/mathseduc/ServerDetailsActivity.kt b/Android/app/src/main/java/com/example/mathseduc/ServerDetailsActivity.kt
index a42b135..fe4dfb3 100644
--- a/Android/app/src/main/java/com/example/mathseduc/ServerDetailsActivity.kt
+++ b/Android/app/src/main/java/com/example/mathseduc/ServerDetailsActivity.kt
@@ -1,6 +1,7 @@
 package com.example.mathseduc
 
 import android.content.Context
+import android.content.Intent
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -8,16 +9,28 @@ import android.view.ViewGroup
 import android.widget.ArrayAdapter
 import android.widget.ListView
 import android.widget.TextView
+import androidx.activity.OnBackPressedCallback
 import androidx.appcompat.app.AppCompatActivity
 import com.example.mathseduc.controllers.ControllerLobby
 import com.example.mathseduc.controllers.ControllerPlayer
 import com.example.mathseduc.controllers.ControllerUtiliser
 import com.example.mathseduc.models.Player
+import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import okhttp3.MultipartBody
 
 class ServerDetailsActivity : AppCompatActivity() {
+
+    private var playerList: List<Player> = emptyList()
+
+    private val onBackPressedCallback: OnBackPressedCallback = object : OnBackPressedCallback(true) {
+        override fun handleOnBackPressed() {
+            MyBackPressed()
+        }
+    }
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        onBackPressedDispatcher.addCallback(this, onBackPressedCallback)
+
         setContentView(R.layout.activity_server_details)
 
         val serverName = intent.getStringExtra("serverName")
@@ -27,38 +40,51 @@ class ServerDetailsActivity : AppCompatActivity() {
         serverNameTextView.text = serverName
 
         val lobbyId = intent.getIntExtra("lobbyId", -1)
-        val playerIds = ControllerPlayer.getPlayersIdFromLobbyId(lobbyId)
-        if (playerIds != null) {
-            val playerList = playerIds.mapNotNull { playerId ->
-                ControllerPlayer.getPlayerInfoById(playerId.toString())
+
+        if (savedInstanceState != null) {
+            playerList = savedInstanceState?.getParcelableArrayList("playerList") ?: emptyList() //TODO deprecated c'est pas normal !!!
+        } else {
+            // Si l'état d'instance est nul, récupérez la liste des joueurs normalement
+            val playerId = ControllerPlayer.getPlayersIdFromLobbyId(lobbyId)
+            if (playerId != null) {
+                playerList = playerId.mapNotNull { playerId ->
+                    ControllerPlayer.getPlayerInfoById(playerId.toString())
+                }
             }
-            val listViewPlayers = findViewById<ListView>(R.id.listViewPlayers)
-            val playerAdapter = PlayerAdapter(this, playerList)
-            listViewPlayers.adapter = playerAdapter
         }
+
+        val listViewPlayers = findViewById<ListView>(R.id.listViewPlayers)
+        val playerAdapter = PlayerAdapter(this, playerList)
+        listViewPlayers.adapter = playerAdapter
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        // Save the player list to the instance state
+        outState.putParcelableArrayList("playerList", ArrayList(playerList))
     }
 
-    override fun onStop() {
-        super.onStop()
+    private fun MyBackPressed() {
 
         val lobbyId = intent.getIntExtra("lobbyId", -1)
 
-        ControllerUtiliser.DeleteUtiliserForLobby(MainActivity.idPlayerConnected,lobbyId)
+        ControllerUtiliser.DeleteUtiliserForLobby(MainActivity.idPlayerConnected, lobbyId)
 
-        if(ControllerLobby.PlayerCreatorIdPresentInLobby(MainActivity.idPlayerConnected,lobbyId)){
+        if (ControllerLobby.PlayerCreatorIdPresentInLobby(MainActivity.idPlayerConnected, lobbyId)) {
 
             val idNextPlayerCreator = ControllerUtiliser.getIdNextPlayerInLobby(lobbyId)
 
-            if (idNextPlayerCreator == -1){
+            if (idNextPlayerCreator == -1) {
                 ControllerLobby.deleteLobby(lobbyId)
             } else {
                 val formDataBuilder = MultipartBody.Builder().setType(MultipartBody.FORM)
 
                 formDataBuilder.addFormDataPart("idplayercreator", idNextPlayerCreator.toString())
 
-                ControllerLobby.updateLobbyIdCreatorLobby(lobbyId,formDataBuilder)
+                ControllerLobby.updateLobbyIdCreatorLobby(lobbyId, formDataBuilder)
             }
         }
+        finish()
     }
 
     class PlayerAdapter(context: Context, players: List<Player>) :
diff --git a/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerChapter.kt b/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerChapter.kt
index 00e2d99..38e8bb5 100644
--- a/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerChapter.kt
+++ b/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerChapter.kt
@@ -39,5 +39,34 @@ class ControllerChapter {
 
             return null
         }
+
+        fun getChapterNameById(idchapter : Int): String? {
+
+            val policy = StrictMode.ThreadPolicy.Builder().permitAll().build()
+            StrictMode.setThreadPolicy(policy)
+
+            // Client HTTP API
+            val client = OkHttpClient()
+
+            // API Access
+            val request = Request.Builder()
+                .url("https://trusting-panini.87-106-126-109.plesk.page/api/chapters/$idchapter/qUOGkWdoPCgbmuqxIC8xiaX0rV1Pw1LoPafkaoHOgszEyD9P2vcOu493xCDZpAqO")
+                .build()
+
+            // API Response
+            client.newCall(request).execute().use { response ->
+                if (!response.isSuccessful) throw IOException("Unexpected code $response")
+
+                // Gson deserialization
+                val gson = Gson()
+                val typeTokenProduct = object : TypeToken<ArrayList<Chapter>>() {}.type
+
+                // Parse API response and return the list of chapters
+                val chapter: ArrayList<Chapter> = gson.fromJson(response.body!!.string(), typeTokenProduct)
+                return chapter[0].name
+            }
+
+            return null
+        }
     }
 }
\ No newline at end of file
diff --git a/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerLobby.kt b/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerLobby.kt
index 06093ea..da8d5a2 100644
--- a/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerLobby.kt
+++ b/Android/app/src/main/java/com/example/mathseduc/controllers/ControllerLobby.kt
@@ -3,6 +3,7 @@ package com.example.mathseduc.controllers
 import android.os.StrictMode
 import android.util.Log
 import com.example.mathseduc.models.Lobby
+import com.example.mathseduc.models.Utiliser
 import com.google.gson.Gson
 import com.google.gson.reflect.TypeToken
 import okhttp3.MultipartBody
@@ -154,5 +155,32 @@ class ControllerLobby {
                 Log.e("updateLobby", "Error updating lobby", e)
             }
         }
+
+        fun getNbPlayerInLobby(lobbyId: Int): Int {
+
+            val policy = StrictMode.ThreadPolicy.Builder().permitAll().build()
+            StrictMode.setThreadPolicy(policy)
+
+            // Client HTTP API
+            val client = OkHttpClient()
+
+            // API Access
+            val request = Request.Builder()
+                .url("https://trusting-panini.87-106-126-109.plesk.page/api/utiliser/$lobbyId/qUOGkWdoPCgbmuqxIC8xiaX0rV1Pw1LoPafkaoHOgszEyD9P2vcOu493xCDZpAqO")
+                .build()
+
+            // API Response
+            client.newCall(request).execute().use { response ->
+                if (!response.isSuccessful) throw IOException("Unexpected code $response")
+
+                // Gson deserialization
+                val gson = Gson()
+                val typeTokenProduct = object : TypeToken<ArrayList<Utiliser>>() {}.type
+
+                val utiliser: ArrayList<Utiliser> = gson.fromJson(response.body!!.string(), typeTokenProduct)
+                return utiliser.size
+            }
+            return -1
+        }
     }
 }
\ No newline at end of file
diff --git a/Android/app/src/main/java/com/example/mathseduc/models/Player.kt b/Android/app/src/main/java/com/example/mathseduc/models/Player.kt
index e4d2eff..b094e32 100644
--- a/Android/app/src/main/java/com/example/mathseduc/models/Player.kt
+++ b/Android/app/src/main/java/com/example/mathseduc/models/Player.kt
@@ -1,7 +1,36 @@
 package com.example.mathseduc.models
 
+import android.os.Parcel
+import android.os.Parcelable
+
 data class Player(
     val id: Int,
     val nickname: String,
     val password: String
-)
\ No newline at end of file
+) : Parcelable {
+    constructor(parcel: Parcel) : this(
+        parcel.readInt(),
+        parcel.readString() ?: "",
+        parcel.readString() ?: ""
+    )
+
+    override fun writeToParcel(parcel: Parcel, flags: Int) {
+        parcel.writeInt(id)
+        parcel.writeString(nickname)
+        parcel.writeString(password)
+    }
+
+    override fun describeContents(): Int {
+        return 0
+    }
+
+    companion object CREATOR : Parcelable.Creator<Player> {
+        override fun createFromParcel(parcel: Parcel): Player {
+            return Player(parcel)
+        }
+
+        override fun newArray(size: Int): Array<Player?> {
+            return arrayOfNulls(size)
+        }
+    }
+}
\ No newline at end of file
diff --git a/Android/app/src/main/res/drawable/chrono.xml b/Android/app/src/main/res/drawable/chrono.xml
new file mode 100644
index 0000000..53e36e8
--- /dev/null
+++ b/Android/app/src/main/res/drawable/chrono.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item android:id="@android:id/background">
+        <shape android:shape="ring"
+            android:thickness="10dp"
+            android:useLevel="false">
+
+            <solid android:color="@color/black"/>
+
+        </shape>
+    </item>
+
+    <item android:id="@+id/chrono">
+
+        <shape android:shape="ring"
+            android:thickness="10dp"
+            android:useLevel="true">
+
+            <solid android:color="@color/white"/>
+
+        </shape>
+
+
+    </item>
+
+</layer-list>
\ No newline at end of file
diff --git a/Android/app/src/main/res/drawable/question_border.xml b/Android/app/src/main/res/drawable/question_border.xml
new file mode 100644
index 0000000..434fbd1
--- /dev/null
+++ b/Android/app/src/main/res/drawable/question_border.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <!-- View border color and width -->
+    <stroke
+        android:width="1dp"
+        android:color="@color/white" >
+    </stroke>
+
+    <!-- The radius makes the corners rounded -->
+    <corners
+        android:radius="2dp"   >
+    </corners>
+
+</shape>
\ No newline at end of file
diff --git a/Android/app/src/main/res/layout/activity_quiz_multi.xml b/Android/app/src/main/res/layout/activity_quiz_multi.xml
new file mode 100644
index 0000000..1a44e15
--- /dev/null
+++ b/Android/app/src/main/res/layout/activity_quiz_multi.xml
@@ -0,0 +1,204 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical">
+
+    <ProgressBar
+        android:id="@+id/progressBar1"
+        android:layout_weight="0.05"
+        style="?android:attr/progressBarStyleHorizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"/>
+
+    <ProgressBar
+        android:id="@+id/progressBar2"
+        android:layout_weight="0.05"
+        style="?android:attr/progressBarStyleHorizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <ProgressBar
+        android:id="@+id/progressBar3"
+        android:layout_weight="0.05"
+        style="?android:attr/progressBarStyleHorizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+    <ProgressBar
+        android:id="@+id/progressBar4"
+        android:layout_weight="0.05"
+        style="?android:attr/progressBarStyleHorizontal"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content" />
+
+
+    <ProgressBar
+        android:id="@+id/chrono"
+        android:layout_weight="0.05"
+        android:paddingHorizontal="10dp"
+        style="?android:attr/progressBarStyle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:indeterminateOnly="false"
+        android:rotation="-90"
+        android:progressDrawable="@drawable/chrono"/>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_weight="1"
+        android:paddingVertical="20dp"
+        android:orientation="horizontal">
+
+        <Space
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+        <TextView
+            android:id="@+id/textView"
+            android:layout_width="0dp"
+            android:layout_height="match_parent"
+            android:layout_gravity="center"
+            android:background="@drawable/question_border"
+            android:gravity="center"
+            android:text="Question"
+            android:layout_weight="5"
+            android:textColor="@color/white"
+            android:textSize="20sp" />
+
+        <Space
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:paddingBottom="10dp"
+            android:orientation="horizontal">
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="0.25" />
+
+            <Button
+                android:id="@+id/button"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:backgroundTint="@color/blue"
+                android:text="Answer1" />
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="0.5" />
+
+            <Button
+                android:id="@+id/button2"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:backgroundTint="@color/green"
+                android:text="Answer2" />
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="0.25" />
+        </LinearLayout>
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="horizontal">
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="0.25" />
+
+            <Button
+                android:id="@+id/button3"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:backgroundTint="@color/orange"
+                android:text="Answer3" />
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="0.5" />
+
+            <Button
+                android:id="@+id/button4"
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="1"
+                android:backgroundTint="@color/purple_500"
+                android:text="Answer4" />
+
+            <Space
+                android:layout_width="0dp"
+                android:layout_height="wrap_content"
+                android:layout_weight="0.25" />
+
+        </LinearLayout>
+
+    </LinearLayout>
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:gravity="center"
+        android:orientation="horizontal">
+
+        <Space
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+
+        <Button
+            android:id="@+id/buttonPasser"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:backgroundTint="@color/red"
+            android:text="Passer" />
+
+        <Space
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="0.25" />
+
+
+        <Button
+            android:id="@+id/buttonValider"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:backgroundTint="@color/green"
+            android:text="Valider" />
+
+        <Space
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1" />
+
+
+    </LinearLayout>
+
+</LinearLayout>
\ No newline at end of file
diff --git a/Android/app/src/main/res/layout/list_view_lobby.xml b/Android/app/src/main/res/layout/list_view_lobby.xml
index b1338ee..c795019 100644
--- a/Android/app/src/main/res/layout/list_view_lobby.xml
+++ b/Android/app/src/main/res/layout/list_view_lobby.xml
@@ -18,34 +18,34 @@
             android:layout_weight="0.4"
             android:gravity="left|center_vertical"
             android:text="Name"
-            android:textSize="16dp" />
+            android:textSize="18dp" />
 
         <TextView
-            android:id="@+id/nbplayers"
+            android:id="@+id/difficulty"
             android:layout_width="0dp"
             android:layout_weight="0.2"
             android:layout_height="match_parent"
             android:gravity="center"
-            android:textSize="10dp"
-            android:text="NbPlayers"/>
+            android:textSize="14dp"
+            android:text="Difficulty"/>
 
         <TextView
-            android:id="@+id/difficulty"
+            android:id="@+id/idchapter"
             android:layout_width="0dp"
             android:layout_weight="0.2"
             android:layout_height="match_parent"
             android:gravity="center"
-            android:textSize="10dp"
-            android:text="Difficulty"/>
+            android:textSize="14dp"
+            android:text="idChapter"/>
 
         <TextView
-            android:id="@+id/idchapter"
+            android:id="@+id/nbplayers"
             android:layout_width="0dp"
             android:layout_weight="0.2"
             android:layout_height="match_parent"
             android:gravity="center"
-            android:textSize="10dp"
-            android:text="idChapter"/>
+            android:textSize="14dp"
+            android:text="NbPlayers"/>
 
     </LinearLayout>
 
diff --git a/Android/app/src/main/res/values/colors.xml b/Android/app/src/main/res/values/colors.xml
index 28ee911..390fba9 100644
--- a/Android/app/src/main/res/values/colors.xml
+++ b/Android/app/src/main/res/values/colors.xml
@@ -11,6 +11,7 @@
     <color name="orange">#FFA500</color>
     <color name="grey">#8C92AC</color>
     <color name="blue">#0d6efd</color>
+    <color name="red">#FF0000</color>
     <color name="blackgrey">#5c636a</color>
     <color name="cyan">#00FFFF</color>
     <color name="turquoise">#40E0D0</color>