diff --git a/sudoku.c b/sudoku.c
index 21c4f60..3df1ccc 100644
--- a/sudoku.c
+++ b/sudoku.c
@@ -231,6 +231,38 @@ void setValue(int q, int f, int val) {
     //printDumpSudoku();
 }
 
+bool checkSolution() {
+    bool foundError = false;
+
+    for (int val = 1; val <= 9; val++) {
+        // check for val every quadrat
+        for (int q = 0; q < 9; q++) {
+            if (!isInQuadrat(q, val)) {
+                foundError = true;
+                fprintf(stderr, "Value %d not found in Q %d\n", val, q);
+            }
+        }
+
+        // check for val in every row
+        for (int r = 0; r < 9; r++) {
+            if (!isInRow(r, val)) {
+                foundError = true;
+                fprintf(stderr, "Value %d not found in row %d\n", val, r);
+            }
+        }
+
+        // check for val in every col
+        for (int c = 0; c < 9; c++) {
+            if (!isInCol(c, val)) {
+                foundError = true;
+                fprintf(stderr, "Value %d not found in col %d\n", val, c);
+            }
+        }
+    }
+
+    return !foundError;
+}
+
 int main() {
     printDumpSudoku();
     bool somethingChanged;
@@ -302,4 +334,6 @@ int main() {
     } while (somethingChanged);
 
     printDumpSudoku();
+
+    checkSolution();
 }
\ No newline at end of file