I added new .h and .cpp file, it compiles but is not fully functional

2048/Display.h

+#ifndef DISPLAY_H
+#define DISPLAY_H
 #include <iostream>
 #include <vector>
 
@@ -10,4 +12,6 @@ class Display {
         void top() {cout << '+' <<  '-' << '-' << '-' << '-' << '-' << '-';} 
         void middle() {cout << '|' << ' ' << ' ' << ' ' << ' ' << ' ' << ' ';}
         void number(int value);
-};
\ No newline at end of file
+};
+
+#endif
\ No newline at end of file

2048/Game2048.cpp

+#include <iostream>
+#include <vector>
+#include "Display.h"
+#include "Movement.h"
+#include "Game2048.h"
+
+using namespace std;
+
+Game2048::Game2048(int gameSize) {
+    this->gameSize = gameSize;
+    score = 0;
+    game = new vector<vector<int>>(gameSize, vector<int>(gameSize,0));
+}
+
+void Game2048::playGame(){
+    *game = { {2,0,0,2}, {2,0,2,2}, {4,2,0,2}, {2,2,2,2}};
+    gameDisplay.showGame(*game);
+    shift.left(*game);
+    gameDisplay.showGame(*game);
+    
+    delete game;
+}
+

2048/Game2048.h

+#include <iostream>
+#include <vector>
+#include "Display.h"
+#include "Movement.h"
+
+using namespace std;
+
+class Game2048 {
+    public:
+        Game2048(int gameSize);
+        void playGame();
+
+        
+    private:
+        int gameSize;
+        int score;
+        Movement shift;
+        Display gameDisplay;
+        vector<vector<int>>* game = nullptr;
+};

2048/Movement.cpp

+#include <iostream>
+#include <vector>
+#include "Movement.h"
+using namespace std;
+
+
+void Movement::up(vector<vector<int>>& game){
+    int i;
+}
+void Movement::down(vector<vector<int>>& game){
+    int i;
+}
+void Movement::right(vector<vector<int>>& game){
+    int i;
+}
+void Movement::left(vector<vector<int>>& game){
+    for (vector<int>& row: game){
+       for (int i = 0; i < row.size() - 1; i++){
+           if ((row.at(i) == row.at(i + 1)) && (row.at(i) != 0)) {
+               add(row.at(i), row.at(i + 1));
+               i--;
+           }
+           else if ((row.at(i) == 0) && (row.at(i + 1) != 0)){
+               transfer(row.at(i), row.at(i+1));
+               i -= 2;
+           }
+       }
+    }
+}
\ No newline at end of file

2048/Movement.h

+#ifndef MOVEMENT_H
+#define MOVEMENT_H
+#include <iostream>
+#include <vector>
+
+using namespace std;
+
+class Movement {
+    public:
+        void up(vector<vector<int>>& game);
+        void down(vector<vector<int>>& game);
+        void right(vector<vector<int>>& game);
+        void left(vector<vector<int>>& game);
+    private:
+        void transfer(int& num1, int& num2){ // to move the number if 
+            num1 = num2;
+            num2 = 0;
+        }
+        int add(int& num1, int& num2){ //this would return adition and would be use for the score
+            num1 += num2;
+            num2 = 0;
+            return num1;
+        }
+};
+
+#endif
\ No newline at end of file

2048/mainTest.cpp

+#include <iostream> 
+#include <vector> // for 2D vector
+#include "Game2048.h"
+using namespace std; 
+  
+int main() {
+    
+    Game2048 game(4);
+    
+    game.playGame();
+    
+    return 0; 
+} 

2048/test.cpp

-#include <iostream> 
-#include <vector> // for 2D vector 
-using namespace std; 
-  
-int main() 
-{ 
-    // Initializing 2D vector "vect" with 
-    // values 
-    vector<vector<int>> vect(4, vector<int>(4,0));
-    //vector<vector<int>> vect{ { 1, 2, 3 }, 
-    //                           { 4, 5, 6 }, 
-     //                          { 7, 8, 9 } }; 
-  
-    // Displaying the 2D vector 
-    for (vector<int> value: vect) { 
-        for (int value1: value) 
-            cout << value1 << " "; 
-        cout << endl; 
-    } 
-  
-    return 0; 
-}