diff --git a/app/src/main/java/gui/RenderableMultidoku.java b/app/src/main/java/gui/RenderableMultidoku.java
index aa4350f..33372f0 100644
--- a/app/src/main/java/gui/RenderableMultidoku.java
+++ b/app/src/main/java/gui/RenderableMultidoku.java
@@ -48,18 +48,17 @@ public class RenderableMultidoku {
 	}
 
 	public boolean setCellValue(Cell cell, int value) {
-		// TODO: fix constraints
-		// for (Sudoku s : doku.getSubGrids()) {
-		// 	int cellIndex = s.getCells().indexOf(cell);
-		// 	// la cellule existe
-		// 	if (cellIndex != -1) {
-		// 		int cellX = cellIndex % s.getSize();
-		// 		int cellY =  cellIndex / s.getSize();
-		// 		if (s.canBePlaced(cellX, cellY, value)) {
-		// 			return false;
-		// 		}
-		// 	}
-		// }
+		for (Sudoku s : doku.getSubGrids()) {
+			int cellIndex = s.getCells().indexOf(cell);
+			// la cellule existe
+			if (cellIndex != -1) {
+				int cellX = cellIndex % s.getSize();
+				int cellY = cellIndex / s.getSize();
+				if (!s.canBePlaced(cellX, cellY, value)) {
+					return false;
+				}
+			}
+		}
 		cell.setSymbolIndex(value);
 		return true;
 	}
@@ -100,7 +99,8 @@ public class RenderableMultidoku {
 		for (Coordinate coordinate : sudokusOffset.values()) {
 			if (minCoordinate == null)
 				minCoordinate = coordinate;
-			minCoordinate = new Coordinate(Math.min(minCoordinate.getX(), coordinate.getX()), Math.min(minCoordinate.getY(), coordinate.getY()));
+			minCoordinate = new Coordinate(Math.min(minCoordinate.getX(), coordinate.getX()),
+					Math.min(minCoordinate.getY(), coordinate.getY()));
 		}
 		return minCoordinate;
 	}
@@ -134,7 +134,8 @@ public class RenderableMultidoku {
 	public static RenderableMultidoku fromMultidoku(MultiDoku doku) {
 		if (doku.getNbSubGrids() == 1) {
 			Sudoku sudoku = doku.getSubGrid(0);
-			return new RenderableMultidoku(doku, sudoku.getBlocks(), sudoku.getCells(), sudoku.getSize(), sudoku.getSize());
+			return new RenderableMultidoku(doku, sudoku.getBlocks(), sudoku.getCells(), sudoku.getSize(),
+					sudoku.getSize());
 		}
 		Map<Sudoku, Coordinate> sudokusOffset = new HashMap<>();
 		// coordinates in cell
@@ -203,4 +204,8 @@ public class RenderableMultidoku {
 		return new RenderableMultidoku(doku, blocks, cells, maxCoordinate.getX(), maxCoordinate.getY());
 	}
 
+	public MultiDoku getDoku() {
+		return doku;
+	}
+
 }
diff --git a/app/src/main/java/sudoku/io/SudokuSerializer.java b/app/src/main/java/sudoku/io/SudokuSerializer.java
index 3cceebf..d56535c 100644
--- a/app/src/main/java/sudoku/io/SudokuSerializer.java
+++ b/app/src/main/java/sudoku/io/SudokuSerializer.java
@@ -10,6 +10,7 @@ import sudoku.structure.Block;
 import sudoku.structure.Cell;
 import sudoku.structure.MultiDoku;
 import sudoku.structure.Sudoku;
+import sudoku.structure.SudokuFactory;
 
 public class SudokuSerializer {
 
@@ -152,7 +153,7 @@ public class SudokuSerializer {
 				sudokuBlocks.add(blocks.get(blockID));
 			}
 
-			Sudoku s = new Sudoku(sudokuCells, sudokuBlocks, null);
+			Sudoku s = new Sudoku(sudokuCells, sudokuBlocks, SudokuFactory.DEFAULT_CONSTRAINTS);
 			s.setBlockWidth(sudokuJsonObject.getInt("blockWidth"));
 			sudokus.add(s);
 		}
diff --git a/app/src/main/java/sudoku/structure/SudokuFactory.java b/app/src/main/java/sudoku/structure/SudokuFactory.java
index cb2c560..719d822 100644
--- a/app/src/main/java/sudoku/structure/SudokuFactory.java
+++ b/app/src/main/java/sudoku/structure/SudokuFactory.java
@@ -12,7 +12,7 @@ import sudoku.constraint.LineConstraint;
 
 public class SudokuFactory {
 
-	private static List<IConstraint> DEFAULT_CONSTRAINTS = Arrays.asList(new BlockConstraint(), new LineConstraint(), new ColumnConstraint());
+	public static List<IConstraint> DEFAULT_CONSTRAINTS = Arrays.asList(new BlockConstraint(), new LineConstraint(), new ColumnConstraint());
 
 	private static List<Cell> initCells(int size) {
 		List<Cell> cells = new ArrayList<>(size * size);