diff --git a/app/src/main/java/sudoku/structure/SudokuFactory.java b/app/src/main/java/sudoku/structure/SudokuFactory.java
index 332e80b..52a6e2f 100644
--- a/app/src/main/java/sudoku/structure/SudokuFactory.java
+++ b/app/src/main/java/sudoku/structure/SudokuFactory.java
@@ -341,8 +341,7 @@ public class SudokuFactory {
 	public static MultiDoku createBasicEmptyRandomBlockDoku(int blockSize, List<IConstraint> constraints) {
 		int blockCellCount = blockSize * blockSize;
 		List<Cell> cells = initCells(blockCellCount);
-		List<Cell> homeLessCells = new ArrayList<>();
-		homeLessCells.addAll(cells);
+        List<Cell> homeLessCells = new ArrayList<>(cells);
 		List<Block> blocks = new ArrayList<>();
 		Random r = new Random();
 		for (int i = 0; i < blockCellCount; i++) {