diff --git a/src/main/c/sudoku.c b/src/main/c/sudoku.c
index cc5739c..ef28e84 100644
--- a/src/main/c/sudoku.c
+++ b/src/main/c/sudoku.c
@@ -27,6 +27,7 @@ void turnFunction(int grid[SIZE][SIZE]);
 void tipFunction(int grid[SIZE][SIZE]);
 void inputFunction(int grid[SIZE][SIZE]);
 void printGrid(int grid[SIZE][SIZE]);
+void doneFunction(int grid[SIZE][SIZE]);
 
 
 int availableLevels[3][3][SIZE][SIZE] = {
@@ -320,6 +321,7 @@ void turnFunction(int grid[SIZE][SIZE]) {
         printf("1. Tip function\n");
         printf("2. Input function\n");
         printf("3. Print Sudoku grid\n");
+        printf("4. Done function\n");
 
          int action;
 
@@ -347,7 +349,7 @@ void turnFunction(int grid[SIZE][SIZE]) {
                 printGrid(grid);
                 break;
             case 4:
-                printf("Case 4.\n");
+                doneFunction(grid);
                 break;
             case 5:
                 printf("Case 5.\n");
@@ -551,6 +553,21 @@ void printGrid(int grid[SIZE][SIZE]) {
     }
 }
 
+void doneFunction(int grid[SIZE][SIZE]) {
+    printf("\nDone function - Checking if the solution is correct...\n");
+
+    for (int i = 0; i < SIZE; i++) {
+        for (int j = 0; j < SIZE; j++) {
+            if (grid[i][j] != solutionLevels[difficulty - 1][selected_level - 1][i][j]) {
+                printf("Incorrect solution. Keep trying!\n");
+                return;
+            }
+        }
+    }
+
+    printf("Congratulations! Sudoku is solved correctly.\n");
+}
+
 
 int main(){
     startSudoku();