diff --git a/app/src/main/java/sudoku/structure/MultiDoku.java b/app/src/main/java/sudoku/structure/MultiDoku.java
index e000664..ecee5fd 100644
--- a/app/src/main/java/sudoku/structure/MultiDoku.java
+++ b/app/src/main/java/sudoku/structure/MultiDoku.java
@@ -190,5 +190,13 @@ public class MultiDoku {
 		Cell cellToEmpty = cells.get(cells.indexOf(cell));
 		cellToEmpty.setSymbolIndex(Cell.NOSYMBOL);
 	}
+
+	public int getNbCells() {
+		int result = 0;
+		for (Sudoku sudoku : this.subGrids) {
+			result += sudoku.getCells().size();
+		}
+		return result;
+	}
 }
 
diff --git a/app/src/main/java/sudoku/structure/SudokuFactory.java b/app/src/main/java/sudoku/structure/SudokuFactory.java
index cfa0ea7..f0cdb0f 100644
--- a/app/src/main/java/sudoku/structure/SudokuFactory.java
+++ b/app/src/main/java/sudoku/structure/SudokuFactory.java
@@ -18,6 +18,13 @@ public class SudokuFactory {
 	 * Générateur de nombre aléatoire.
 	 */
 	private static final Random random = new Random();
+	/**
+	 * Difficulté avec le ration des cases qui seront vides.
+	 */
+	private static final double VERY_EASY = 0.1;
+	private static final double EASY = 0.25;
+	private static final double MEDIUM = 0.5;
+	private static final double HARD = 0.75;
 	/**
 	 * Liste des contraintes par défaut d'un Multi- ou Sudoku.
 	 * Comprend les contraintes de blocs, de lignes, et de colonnes.
@@ -106,18 +113,19 @@ public class SudokuFactory {
 
 	/**
 	 * Créée un MultiDoku de difficulté difficulty à partir d'un MultiDoku fourni.
-	 * @param doku MultiDoku, MultiDoku dont on doit vider des Cells.
-	 * @param difficulty int, nombre de cases à retirer.
+	 *
+	 * @param doku           MultiDoku, MultiDoku dont on doit vider des Cells.
+	 * @param nbCellsToEmpty int, nombre de cases à retirer.
 	 * @return boolean, valant true si un MultiDoku de difficulté donnée peut être créée, false sinon.
 	 * @throws Exception si la difficulté n'est pas compatible avec la taille du MultiDoku.
 	 */
-	public static boolean newDokuFromFilledOne (MultiDoku doku, int difficulty) throws Exception {
+	public static boolean newDokuFromFilledOne (MultiDoku doku, int nbCellsToEmpty) throws Exception {
 
-		if (difficulty > doku.getCells().size()) {
+		if (nbCellsToEmpty > doku.getCells().size()) {
 			throw new Exception();
 		}
 
-		if (difficulty == 0) {
+		if (nbCellsToEmpty == 0) {
 			return true;
 		}
 
@@ -130,7 +138,7 @@ public class SudokuFactory {
 			int oldSymbol = cellToEmpty.empty();
 
 			if (Solver.countSolution(doku) == 1) {
-				if (newDokuFromFilledOne(doku, --difficulty)) {
+				if (newDokuFromFilledOne(doku, --nbCellsToEmpty)) {
 					return true;
 				}
 			}
@@ -228,4 +236,30 @@ public class SudokuFactory {
 
 		return new MultiDoku(Arrays.asList(sudoku1, sudoku2, sudoku3, sudoku4, sudoku5));
 	}
+
+	public static MultiDoku createBasicRectangleDokuToSolve(int width, int height, double difficulty) throws Exception {
+		MultiDoku doku = createBasicEmptyRectangleSudoku(width, height);
+		Solver.solveRandom(doku, random);
+		int nbCellsToEmpty = (int)(difficulty*doku.getNbCells());
+		boolean successfull = newDokuFromFilledOne(doku, nbCellsToEmpty);
+		if (!successfull) {
+			throw new Exception("Canno't create this doku with this difficulty");
+		}
+		return doku;
+	}
+
+	public static MultiDoku createBasicSquareDokuToSolve(int size, double difficulty) throws Exception {
+		return createBasicRectangleDokuToSolve(size, size, difficulty);
+	}
+
+	public static MultiDoku createBasicXShapedMultiDokuToSolve(int size, double difficulty) throws Exception {
+		MultiDoku doku = createBasicXShapedMultidoku(size);
+		Solver.solveRandom(doku, random);
+		int nbCellsToEmpty = (int)(difficulty*doku.getNbCells());
+		boolean successful = newDokuFromFilledOne(doku, nbCellsToEmpty);
+		if (!successful) {
+			throw new Exception("Cannot create this Doku with this difficulty");
+		}
+		return doku;
+	}
 }