diff --git a/app/save/save-1.json b/app/save/save-1.json
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diff --git a/app/save/save.json b/app/save/save.json
deleted file mode 100644
index 673d5c9..0000000
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-         67,
-         68,
-         69,
-         70,
-         71,
-         72,
-         73,
-         74,
-         75,
-         76,
-         77,
-         78,
-         79,
-         80
-      ],
-      "blocks": [
-         0,
-         1,
-         2,
-         3,
-         4,
-         5,
-         6,
-         7,
-         8
-      ],
-      "constraints": [
-         0,
-         1,
-         2
-      ]
-   }]
-}
\ No newline at end of file
diff --git a/app/src/main/java/sudoku/Main.java b/app/src/main/java/sudoku/Main.java
index e4be138..4d90b66 100644
--- a/app/src/main/java/sudoku/Main.java
+++ b/app/src/main/java/sudoku/Main.java
@@ -7,6 +7,7 @@ import gui.RenderableMultidoku;
 import gui.Symbols;
 import sudoku.io.ConsoleInterface;
 import sudoku.io.SudokuPrinter;
+import sudoku.io.SudokuSerializer;
 import sudoku.solver.RandomSolver;
 import sudoku.solver.Solver;
 import sudoku.structure.MultiDoku;
@@ -22,12 +23,14 @@ public class Main {
     public static void voidTest(){
         MultiDoku md = SudokuFactory.createBasicXShapedMultidoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
         SudokuPrinter.printMultiDoku(RenderableMultidoku.fromMultidoku(md), Symbols.Numbers, 3, 3);
+        SudokuSerializer.saveMultiDoku(md);
     }
 
     public static void filledTest(){
         MultiDoku md = SudokuFactory.createBasicXShapedMultidoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
         new RandomSolver().solve(md);
         SudokuPrinter.printMultiDoku(RenderableMultidoku.fromMultidoku(md), Symbols.Numbers, 3, 3);
+        SudokuSerializer.saveMultiDoku(md);
     }
 
     public static void main(String[] args) {
@@ -36,7 +39,7 @@ public class Main {
         voidTest();
         filledTest();
         filledTest();
-        */
+         */
         console.welcome();
     }
 }
diff --git a/app/src/main/java/sudoku/io/ConsoleInterface.java b/app/src/main/java/sudoku/io/ConsoleInterface.java
index f238c71..42216ee 100644
--- a/app/src/main/java/sudoku/io/ConsoleInterface.java
+++ b/app/src/main/java/sudoku/io/ConsoleInterface.java
@@ -4,14 +4,12 @@ import gui.RenderableMultidoku;
 import gui.Symbols;
 import sudoku.constraint.*;
 import sudoku.solver.RandomSolver;
-import sudoku.solver.Solver;
 import sudoku.structure.Difficulty;
 import sudoku.structure.MultiDoku;
 import sudoku.structure.SudokuFactory;
 
 import java.util.ArrayList;
 import java.util.List;
-import java.util.Random;
 import java.util.Scanner;
 
 public class ConsoleInterface {
@@ -20,25 +18,35 @@ public class ConsoleInterface {
     public void welcome(){
         System.out.println("Welcome to our Sudoku Solver!");
         System.out.println("This is the project of Melvyn Bauvent, Lilas Grenier and Simon Priblyski.");
-        start();
+        System.out.println("Do you have a save sudoku you would like to continue? (y/n, default n)");
+        if (reader.next().equalsIgnoreCase("y")){
+            useSavedDoku();
+        }
+        else {
+            createDoku();
+        }
     }
 
-    public void start(){
+    private void useSavedDoku() {
+        System.out.println("What save should we use? Please enter the save number.");
+        MultiDoku md = saveChoice();
+        int blockWidth = md.getSubGrid(0).getBlockWidth();
+        int blockHeight = md.getSubGrid(0).getBlocks().getFirst().getCells().size() / blockWidth;
+        List<String> listSymbols = pickSymbols(blockWidth*blockHeight);
+        System.out.println("This is the saved sudoku:");
+        showMultidoku(md, listSymbols, blockWidth, blockHeight);
+    }
+
+    public void createDoku(){
         System.out.println("First of all, you need to tell me the size of the sudoku you want to generate.");
         int width = getBlockWidth();
         int height = getBlockHeight();
         System.out.println("Your sudoku will have blocks of a " + width + " x " + height + " format.");
         int numberOfSymbols = width * height;
-        System.out.println("Would you like to pick the " + numberOfSymbols + " symbols from the sudoku? (y/n, default 'no' will use numbers)" );
-        List<String> listSymbols = new ArrayList<>();
-        if(reader.next().equalsIgnoreCase("y")){
-            pickSymbols(listSymbols, numberOfSymbols);
-        }
-        else {
-            listSymbols = Symbols.Numbers.getSymbols();
-        }
+        List<String> listSymbols = pickSymbols(numberOfSymbols);
         List<Constraint> listConstraints = getListConstraints();
-        System.out.println("Now that we have the size of our sudoku, would you rather have a single grid ('one', default), " +
+        System.out.println("Now that we have the size of our sudoku, " +
+                "would you rather have a single grid ('one', default), " +
                 "or a a multidoku composed of 5 subgrids ('multi') ?");
         MultiDoku doku;
         if (reader.next().equalsIgnoreCase("multi")) {
@@ -47,11 +55,11 @@ public class ConsoleInterface {
         else {
             doku = SudokuFactory.createBasicEmptyRectangleDoku(width, height, listConstraints);
         }
-        RenderableMultidoku rm = RenderableMultidoku.fromMultidoku(doku);
         System.out.println("Your sudoku will look like this:");
-        SudokuPrinter.printMultiDoku(rm, listSymbols, width, height);
+        showMultidoku(doku, listSymbols, width, height);
         System.out.println("We now will fill this sudoku.");
-        System.out.println("What level of difficulty would you like? ('very easy', 'easy', 'medium' (default), 'hard', 'full' (sudoku fully completed))");
+        System.out.println("What level of difficulty would you like?" +
+                " ('very easy', 'easy', 'medium' (default), 'hard', 'full' (sudoku fully completed))");
         String difficulty = reader.next().toLowerCase();
         if (difficulty.equals("full")) {
             generateFullDoku(doku);
@@ -60,7 +68,21 @@ public class ConsoleInterface {
             generatePartialDoku(doku, difficulty);
         }
         System.out.println("Here's your sudoku !");
-        SudokuPrinter.printMultiDoku(rm, listSymbols, width, height);
+        showMultidoku(doku, listSymbols, width, height);
+    }
+
+    private MultiDoku saveChoice() {
+        int nbSave;
+        MultiDoku md = null;
+        do {
+            nbSave = reader.nextInt();
+            try {
+                md = SudokuSerializer.getSavedMultiDoku(nbSave);
+            } catch (Exception e) {
+                System.out.println("There seems to be a problem with this save, please try again.");
+            }
+        } while (md == null);
+        return md;
     }
 
     public int getBlockWidth() {
@@ -91,18 +113,30 @@ public class ConsoleInterface {
         return (size > 0);
     }
 
-    private void pickSymbols(List<String> listSymbols, int numberOfSymbols) {
-        System.out.println("You have chosen to pick your own symbols.");
-        for (int i = 0; i < numberOfSymbols; i++) {
-            System.out.println("Choose for the symbol number " + i + ": ");
-            String newSymbol = reader.next();
-            while (listSymbols.contains(newSymbol)) {
-                System.out.println("This symbol has already been given. Try again:");
-                newSymbol = reader.next();
+    private List<String> pickSymbols(int numberOfSymbols) {
+        System.out.println("Would you like to pick the " + numberOfSymbols + " symbols from the sudoku? (y/n, default 'no' will use numbers)");
+        if (reader.next().equalsIgnoreCase("y")) {
+            List<String> listSymbols = new ArrayList<>();
+            System.out.println("You have chosen to pick your own symbols.");
+            for (int i = 0; i < numberOfSymbols; i++) {
+                System.out.println("Choose for the symbol number " + i + ": ");
+                String newSymbol = reader.next();
+                while (listSymbols.contains(newSymbol)) {
+                    System.out.println("This symbol has already been given. Try again:");
+                    newSymbol = reader.next();
+                }
+                listSymbols.add(newSymbol);
             }
-            listSymbols.add(newSymbol);
+            System.out.println("You chose the symbols: " + listSymbols.toString());
+            return listSymbols;
+        } else {
+            System.out.println("What existing sets of symbols do you want to use? Numbers ('n', default), letters ('l'), or emojis ('e')?");
+            return switch (reader.next().toLowerCase()) {
+                case "l" -> Symbols.Letters.getSymbols();
+                case "e" -> Symbols.Emojis.getSymbols();
+                default -> Symbols.Numbers.getSymbols();
+            };
         }
-        System.out.println("You chose the symbols: " + listSymbols.toString());
     }
 
     private List<Constraint> getListConstraints() {
@@ -133,4 +167,12 @@ public class ConsoleInterface {
         new RandomSolver().solve(doku);
     }
 
+    private void showMultidoku(MultiDoku doku, List<String> listSymbols, int width, int height){
+        showMultiDoku(RenderableMultidoku.fromMultidoku(doku), listSymbols, width, height);
+    }
+
+    private void showMultiDoku(RenderableMultidoku doku, List<String> listSymbols, int width, int height){
+        SudokuPrinter.printMultiDoku(doku, listSymbols, width, height);
+    }
+
 }