diff --git a/source/Trek-12/Models/Game/Cell.cs b/source/Trek-12/Models/Game/Cell.cs
index 49fe4bb..2548cfe 100644
--- a/source/Trek-12/Models/Game/Cell.cs
+++ b/source/Trek-12/Models/Game/Cell.cs
@@ -26,6 +26,9 @@
         /// </summary>
         private bool IsDangerous { get; set; }
 
+        public bool Valid { get; set; }
+
+
         /// <summary>
         /// Atribute to know if the cell is a penalty cell.
         /// </summary>
@@ -41,6 +44,7 @@
         {
             IsDangerous = isDangerous;
             Penalty = false;
+            Valid = false;
         }
 
         /// <summary>
diff --git a/source/Trek-12/Models/Game/Game.cs b/source/Trek-12/Models/Game/Game.cs
index bb07919..23a20a2 100644
--- a/source/Trek-12/Models/Game/Game.cs
+++ b/source/Trek-12/Models/Game/Game.cs
@@ -119,7 +119,7 @@ namespace Models.Game
         /// <param name="result">The result of the dice operation to be placed in the cell.</param>
         private void PlaceResult(Cell playerChoice, int result)
         {
-            if (Turn == 1 || GameRules.NearCellIsValid(playerChoice, UsedMap.Boards))
+            if (Turn == 1 || GameRules.NearCellIsValid(playerChoice, UsedMap.Boards.ToList()))
             {
                 playerChoice.Value = result;
                 BoardUpdated?.Invoke(this, EventArgs.Empty);
@@ -226,14 +226,14 @@ namespace Models.Game
                 throw new InvalidCellCoordinatesException("Invalid cell coordinates. Please choose again.");
             }
 
-            if (!GameRules.IsCellValid(cell, UsedMap.Boards))
+            if (!GameRules.IsCellValid(cell, UsedMap.Boards.ToList()))
             {
                 throw new InvalidCellException("Cell is not valid. Please choose again.");
             }
 
             PlaceResult(cell, result);
             GameRules.IsZoneValidAndAddToZones(cell, UsedMap);
-            AddToRopePath(cell, GameRules.EveryAdjacentCells(cell, UsedMap.Boards));
+            AddToRopePath(cell, GameRules.EveryAdjacentCells(cell, UsedMap.Boards.ToList()));
             CellChosen?.Invoke(this, new CellChosenEventArgs(cell, result));
             BoardUpdated?.Invoke(this, EventArgs.Empty);
         }
diff --git a/source/Trek-12/Models/Game/Map.cs b/source/Trek-12/Models/Game/Map.cs
index e1399bb..ff2f935 100644
--- a/source/Trek-12/Models/Game/Map.cs
+++ b/source/Trek-12/Models/Game/Map.cs
@@ -11,7 +11,8 @@ namespace Models.Game
         /// <summary>
         /// It is the list of cells on the map.
         /// </summary>
-        public List<Cell> Boards { get; private set; }
+        public ReadOnlyObservableCollection<Cell> Boards { get; private set; }
+        ObservableCollection<Cell> board = new ObservableCollection<Cell>();
         
         /// <summary>
         /// It is the backgrond image of the map
@@ -40,7 +41,8 @@ namespace Models.Game
         /// <param name="background">The background of the map.</param>
         public Map(string background)
         {
-            Boards = InitializeBoards();
+            Boards = new ReadOnlyObservableCollection<Cell>(board);
+            InitializeBoards(board);
             Background = background;
             OperationGrid = new ReadOnlyObservableCollection<OperationCell>(operationGrid);
             InitializeOperationGrid(operationGrid);
@@ -52,14 +54,31 @@ namespace Models.Game
         /// Initializes the boards of the map.
         /// </summary>
         /// <returns>Return the boards</returns>
-        private List<Cell> InitializeBoards()
+        private void InitializeBoards(ObservableCollection<Cell> board)
         {
-            var boards = new List<Cell>();
-            for (int i = 0; i < 36; i++) // 6x6 board
+            for (int i = 0; i < 49; i++) // 6x6 board
             {
-                boards.Add(new Cell(i / 6, i % 6));
+                board.Add(new Cell(i / 7, i % 7));
             }
-            return boards;
+            board[1].Valid = true;
+            board[3].Valid = true;
+            board[4].Valid = true;
+            board[5].Valid = true;
+            board[9].Valid = true;
+            board[12].Valid = true;
+            board[15].Valid = true;
+            board[16].Valid = true;
+            board[17].Valid = true;
+            board[21].Valid = true;
+            board[24].Valid = true;
+            board[25].Valid = true;
+            board[28].Valid = true;
+            board[30].Valid = true;
+            board[31].Valid = true;
+            board[32].Valid = true;
+            board[40].Valid = true;
+            board[41].Valid = true;
+            board[48].Valid = true;
         }
         
         /// <summary>
diff --git a/source/Trek-12/Models/Rules/Rules.cs b/source/Trek-12/Models/Rules/Rules.cs
index 8a7dc43..8482653 100644
--- a/source/Trek-12/Models/Rules/Rules.cs
+++ b/source/Trek-12/Models/Rules/Rules.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Collections.ObjectModel;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -95,7 +96,7 @@ namespace Models.Rules
 
             List<Cell> adjacentCells = new List<Cell>();
 
-            adjacentCells = EveryAdjacentCells(chosenCell, map.Boards);
+            adjacentCells = EveryAdjacentCells(chosenCell, map.Boards.ToList());
 
             foreach(var cells in adjacentCells)
             {
diff --git a/source/Trek-12/Trek-12/Views/PageBoard.xaml b/source/Trek-12/Trek-12/Views/PageBoard.xaml
index a571d0f..6527854 100644
--- a/source/Trek-12/Trek-12/Views/PageBoard.xaml
+++ b/source/Trek-12/Trek-12/Views/PageBoard.xaml
@@ -5,10 +5,33 @@
              Title="Board">
     <Grid RowDefinitions="*,auto">
         <Grid ColumnDefinitions="*,auto">
+            <CollectionView ItemsSource="{Binding ListMap[0].Boards}"
+                            Grid.Column="0"
+                            SelectionMode="Single"
+                            WidthRequest="350"
+                            HeightRequest="350"
+                            ItemsLayout="VerticalGrid,7"
+                            BackgroundColor="Aqua">
+                <CollectionView.ItemTemplate>
+                    <DataTemplate>
+                        <Frame
+                               IsVisible="{Binding Valid}"
+                               BorderColor="DarkGray"
+                               CornerRadius="25"
+                               HeightRequest="50"
+                               WidthRequest="50"
+                               BackgroundColor="Transparent"
+                                VerticalOptions="Center"
+                            HorizontalOptions="Center"
+                               >
+                        </Frame>
+                    </DataTemplate>
+                </CollectionView.ItemTemplate>
+            </CollectionView>
             <CollectionView ItemsSource="{Binding ListMap[0].OperationGrid}"
-                            ItemsLayout="HorizontalGrid,5"
+                            ItemsLayout="VerticalGrid,5"
                             Grid.Column="1"
-                            HeightRequest="250"
+                            WidthRequest="250"
                             SelectionMode="Single"
                             Margin="20">
                 <CollectionView.ItemTemplate  >