diff --git a/app/src/main/java/sudoku/io/SudokuPrinter.java b/app/src/main/java/sudoku/io/SudokuPrinter.java
index 263965a..c59228d 100644
--- a/app/src/main/java/sudoku/io/SudokuPrinter.java
+++ b/app/src/main/java/sudoku/io/SudokuPrinter.java
@@ -20,4 +20,27 @@ public class SudokuPrinter {
 			System.out.println(line);
 		}
 	}
+
+	public static String toStringRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight) {
+		StringBuilder result = new StringBuilder();
+		for (int y = 0; y < s.getSize(); y++) {
+			// Ajouter une ligne vide entre les blocs horizontaux
+			if (y % blockHeight == 0 && y > 0) {
+				result.append("\n");
+			}
+			StringBuilder line = new StringBuilder("[ ");
+			for (int x = 0; x < s.getSize(); x++) {
+				// Ajouter la valeur de la cellule
+				line.append((s.getCell(x, y).getSymbolIndex() + 1)).append(" ");
+
+				// Ajouter un séparateur vertical entre les blocs
+				if (x % blockWidth == blockWidth - 1 && x != s.getSize() - 1) {
+					line.append("| ");
+				}
+			}
+			line.append("]");
+			result.append(line).append("\n");
+		}
+		return result.toString();
+	}
 }
diff --git a/app/src/main/java/sudoku/solver/Solver.java b/app/src/main/java/sudoku/solver/Solver.java
index 0a79cd1..0af51c5 100644
--- a/app/src/main/java/sudoku/solver/Solver.java
+++ b/app/src/main/java/sudoku/solver/Solver.java
@@ -1,13 +1,18 @@
 package sudoku.solver;
 
+import sudoku.io.SudokuPrinter;
 import sudoku.structure.MultiDoku;
 import sudoku.structure.Cell;
+import sudoku.structure.Sudoku;
 
 import java.util.List;
 import java.util.Random;
 import java.util.concurrent.CancellationException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
 
 public class Solver {
+    private static final Logger logger = Logger.getLogger("SolverLogger");
 
     /**
      * Résout le multidoku passé en paramètre si c'est possible.
@@ -21,6 +26,9 @@ public class Solver {
         if (Thread.interrupted())
 			throw new CancellationException("User wants to stop the solver");
 
+        Sudoku sudoku = doku.getSubGrid(0);
+        logger.log(Level.INFO, '\n'+SudokuPrinter.toStringRectangleSudoku(sudoku, sudoku.getSize(), sudoku.getSize()));
+
         if (doku.isValid()) {
             return true;
         }
@@ -32,7 +40,7 @@ public class Solver {
 
         List<Integer> possibleSymbols = doku.getPossibleSymbolsOfCell(cellToFill);
 
-        while (!possibleSymbols.isEmpty()){
+        while (!possibleSymbols.isEmpty()) {
             int nextPossibleSymbolIndex = rand.nextInt(possibleSymbols.size());
             int nextSymbol = possibleSymbols.get(nextPossibleSymbolIndex);
 
diff --git a/app/src/main/java/sudoku/structure/MultiDoku.java b/app/src/main/java/sudoku/structure/MultiDoku.java
index 5abfb11..6a78359 100644
--- a/app/src/main/java/sudoku/structure/MultiDoku.java
+++ b/app/src/main/java/sudoku/structure/MultiDoku.java
@@ -1,5 +1,7 @@
 package sudoku.structure;
 
+import sudoku.constraint.IConstraint;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -60,12 +62,20 @@ public class MultiDoku {
 	}
 
 	public List<Integer> getPossibleSymbolsOfCell(Cell cellToFill) {
-		for (Sudoku sudoku : this.subGrids) {
-			if (sudoku.contains(cellToFill)) {
-				return sudoku.getPossibleSymbolsOfCell(cellToFill);
-			}
-		}
-		return new ArrayList<>();
+		List<Integer> result = new ArrayList<>();
+		boolean hasBeenFill = false;
+
+        for (Sudoku sudoku : this.subGrids) {
+            if (sudoku.contains(cellToFill)) {
+                if (!hasBeenFill) {
+                    result.addAll(sudoku.getPossibleSymbolsOfCell(cellToFill));
+                    hasBeenFill = true;
+                } else {
+                    result.retainAll(sudoku.getPossibleSymbolsOfCell(cellToFill));
+                }
+            }
+        }
+		return result;
 	}
 
 	public List<Sudoku> getSubGrids() {
diff --git a/app/src/main/java/sudoku/structure/SudokuFactory.java b/app/src/main/java/sudoku/structure/SudokuFactory.java
index 82f40b1..88d31f9 100644
--- a/app/src/main/java/sudoku/structure/SudokuFactory.java
+++ b/app/src/main/java/sudoku/structure/SudokuFactory.java
@@ -152,7 +152,6 @@ public class SudokuFactory {
 		 */
 
 		Sudoku sudoku1 = createSquareSudoku(size);
-
 		Sudoku sudoku2 = createSquareSudoku(size);
 		Sudoku sudoku3 = createSquareSudoku(size);
 		Sudoku sudoku4 = createSquareSudoku(size);