diff --git a/Enter$1.class b/Enter$1.class
deleted file mode 100644
index be8b132..0000000
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diff --git a/Enter.class b/Enter.class
deleted file mode 100644
index a429358..0000000
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diff --git a/Enter.java b/Enter.java
index d93f60a..36a1403 100644
--- a/Enter.java
+++ b/Enter.java
@@ -36,8 +36,12 @@ public class Enter extends JPanel {
                         String valueStr = JOptionPane.showInputDialog(null, "Enter value for the selected cell:");
                         try {
                             int value = Integer.parseInt(valueStr);
-                            grid[selectedRow][selectedCol] = value;
-                            repaint();
+                            if (isValidValue(value, selectedRow, selectedCol)) {
+                                grid[selectedRow][selectedCol] = value;
+                                repaint();
+                            } else {
+                                JOptionPane.showMessageDialog(null, "Not possible.");
+                            }
                         } catch (NumberFormatException ex) {
                             JOptionPane.showMessageDialog(null, "Invalid input. Please enter a number.");
                         }
@@ -50,41 +54,67 @@ public class Enter extends JPanel {
     }
 
     public int[][] getInitialGrid() {
-    return initialGrid;
+        return initialGrid;
     }
 
+    private boolean isValidValue(int value, int row, int col) {
+        // Vérifier la ligne
+        for (int i = 0; i < grid[row].length; i++) {
+            if (grid[row][i] == value && i != col) {
+                return false;
+            }
+        }
+
+        // Vérifier la colonne
+        for (int i = 0; i < grid.length; i++) {
+            if (grid[i][col] == value && i != row) {
+                return false;
+            }
+        }
+
+        // Vérifier la région
+        int regionRow = row / REGION_SIZE * REGION_SIZE;
+        int regionCol = col / REGION_SIZE * REGION_SIZE;
+        for (int i = regionRow; i < regionRow + REGION_SIZE; i++) {
+            for (int j = regionCol; j < regionCol + REGION_SIZE; j++) {
+                if (grid[i][j] == value && (i != row || j != col)) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
 
     @Override
     protected void paintComponent(Graphics g) {
-    super.paintComponent(g);
+        super.paintComponent(g);
 
-    // Dessiner les contours de la grille (en gras)
-    Graphics2D g2d = (Graphics2D) g;
-    Stroke oldStroke = g2d.getStroke(); // Sauvegarder le style de ligne précédent
-    g2d.setStroke(new BasicStroke(4)); // Épaisseur de ligne de 4 pixels
+        // Dessiner les contours de la grille (en gras)
+        Graphics2D g2d = (Graphics2D) g;
+        Stroke oldStroke = g2d.getStroke(); // Sauvegarder le style de ligne précédent
+        g2d.setStroke(new BasicStroke(4)); // Épaisseur de ligne de 4 pixels
 
-    for (int i = 0; i <= GRID_SIZE * REGION_SIZE; i++) {
-        if (i % REGION_SIZE == 0) {
-            g2d.drawLine(0, i * CELL_SIZE, GRID_SIZE * REGION_SIZE * CELL_SIZE, i * CELL_SIZE);
-            g2d.drawLine(i * CELL_SIZE, 0, i * CELL_SIZE, GRID_SIZE * REGION_SIZE * CELL_SIZE);
+        for (int i = 0; i <= GRID_SIZE * REGION_SIZE; i++) {
+            if (i % REGION_SIZE == 0) {
+                g2d.drawLine(0, i * CELL_SIZE, GRID_SIZE * REGION_SIZE * CELL_SIZE, i * CELL_SIZE);
+                g2d.drawLine(i * CELL_SIZE, 0, i * CELL_SIZE, GRID_SIZE * REGION_SIZE * CELL_SIZE);
+            }
         }
-    }
 
-    // Rétablir le style de ligne précédent
-    g2d.setStroke(oldStroke);
+        // Rétablir le style de ligne précédent
+        g2d.setStroke(oldStroke);
 
-    // Dessiner les cases de la grille
-    for (int i = 0; i < GRID_SIZE * REGION_SIZE; i++) {
-        for (int j = 0; j < GRID_SIZE * REGION_SIZE; j++) {
-            g.setColor(Color.BLACK);
-            g.drawRect(j * CELL_SIZE, i * CELL_SIZE, CELL_SIZE, CELL_SIZE);
-            int value = grid[i][j];
-            if (value != 0) {
-                g.drawString(String.valueOf(value), j * CELL_SIZE + CELL_SIZE / 2, i * CELL_SIZE + CELL_SIZE / 2);
+        // Dessiner les cases de la grille
+        for (int i = 0; i < GRID_SIZE * REGION_SIZE; i++) {
+            for (int j = 0; j < GRID_SIZE * REGION_SIZE; j++) {
+                g.setColor(Color.BLACK);
+                g.drawRect(j * CELL_SIZE, i * CELL_SIZE, CELL_SIZE, CELL_SIZE);
+                int value = grid[i][j];
+                if (value != 0) {
+                    g.drawString(String.valueOf(value), j * CELL_SIZE + CELL_SIZE / 2, i * CELL_SIZE + CELL_SIZE / 2);
+                }
             }
         }
     }
 }
-
-
-}
diff --git a/Main$1.class b/Main$1.class
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diff --git a/Main.class b/Main.class
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diff --git a/Reset.class b/Reset.class
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diff --git a/Resolve.class b/Resolve.class
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diff --git a/SudokuDraw.class b/SudokuDraw.class
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diff --git a/SudokuGenerator.class b/SudokuGenerator.class
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diff --git a/SudokuPanel.class b/SudokuPanel.class
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