diff --git a/app/src/main/java/gui/RenderableMultidoku.java b/app/src/main/java/gui/RenderableMultidoku.java
index cf3abab..7b1dc16 100644
--- a/app/src/main/java/gui/RenderableMultidoku.java
+++ b/app/src/main/java/gui/RenderableMultidoku.java
@@ -79,8 +79,39 @@ public class RenderableMultidoku {
 	}
 
 	private static Coordinate getMinSudokuOffset(Map<Sudoku, Coordinate> sudokusOffset) {
-		// TODO
-		return null;
+		Coordinate minCoordinate = null;
+		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()));
+		}
+		return minCoordinate;
+	}
+
+	private static Coordinate getMaxSudokuCoordinate(Map<Sudoku, Coordinate> sudokusOffset) {
+		Coordinate maxCoordinate = null;
+		Sudoku maxSudoku = null;
+		float maxDistanceSquared = 0;
+		for (var entry : sudokusOffset.entrySet()) {
+			Coordinate coordinate = entry.getValue();
+			float distanceSquared = coordinate.getX() * coordinate.getX() + coordinate.getY() * coordinate.getY();
+			if (maxCoordinate == null) {
+				maxCoordinate = coordinate;
+				maxDistanceSquared = distanceSquared;
+				maxSudoku = entry.getKey();
+			}
+
+			if (distanceSquared > maxDistanceSquared) {
+				maxDistanceSquared = distanceSquared;
+				maxSudoku = entry.getKey();
+				maxCoordinate = coordinate;
+			}
+		}
+
+		int blockWidth = maxSudoku.getBlockWidth();
+		int blockHeight = maxSudoku.getSize() / blockWidth;
+
+		return new Coordinate((maxCoordinate.getX() + blockHeight) * blockWidth, (maxCoordinate.getY() + blockWidth) * blockHeight);
 	}
 
 	public static RenderableMultidoku fromMultidoku(MultiDoku doku) {
@@ -126,9 +157,21 @@ public class RenderableMultidoku {
 		List<Block> blocks = new ArrayList<>();
 		List<Cell> cells = new ArrayList<>();
 
-		// TODO: dernière étape
+		for (Sudoku sudoku : doku.getSubGrids()) {
+			for (Block block : sudoku.getBlocks()) {
+				if (!blocks.contains(block)) {
+					blocks.add(block);
+				}
+			}
+			for (Cell cell : sudoku.getCells()) {
+				if (!cells.contains(cell))
+					cells.add(cell);
+			}
+		}
 
-		return new RenderableMultidoku(blocks, cells, 0, 0);
+		Coordinate maxCoordinate = getMaxSudokuCoordinate(sudokusOffset);
+
+		return new RenderableMultidoku(blocks, cells, maxCoordinate.getX(), maxCoordinate.getY());
 	}
 
 }