diff --git a/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/CreateSudokuActivity.java b/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/CreateSudokuActivity.java
index f9e4bad..ca93614 100644
--- a/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/CreateSudokuActivity.java
+++ b/app/src/main/java/org/secuso/privacyfriendlysudoku/ui/CreateSudokuActivity.java
@@ -8,10 +8,14 @@ import android.preference.PreferenceManager;
 import android.view.View;
 import android.view.WindowManager;
 import android.widget.LinearLayout;
+import android.widget.Toast;
+
+import androidx.appcompat.app.AppCompatDelegate;
 
 import org.secuso.privacyfriendlysudoku.controller.GameController;
 import org.secuso.privacyfriendlysudoku.controller.Symbol;
 import org.secuso.privacyfriendlysudoku.controller.helper.GameInfoContainer;
+import org.secuso.privacyfriendlysudoku.controller.qqwing.QQWing;
 import org.secuso.privacyfriendlysudoku.game.GameDifficulty;
 import org.secuso.privacyfriendlysudoku.game.GameType;
 import org.secuso.privacyfriendlysudoku.ui.view.R;
@@ -30,6 +34,17 @@ public class CreateSudokuActivity extends BaseActivity {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         SharedPreferences sharedPref = PreferenceManager.getDefaultSharedPreferences(this);
+
+        if (sharedPref.getBoolean("pref_dark_mode_setting", false )) {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_YES);
+        } else {
+            AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);
+        }
+
+        if(sharedPref.getBoolean("pref_keep_screen_on", true)) {
+            getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
+        }
+
         gameController = new GameController(sharedPref, getApplicationContext());
 
         if(sharedPref.getBoolean("pref_keep_screen_on", true)) {
@@ -92,4 +107,26 @@ public class CreateSudokuActivity extends BaseActivity {
         finish();
         super.onBackPressed();
     }
+
+    private void verify() {
+        Toast.makeText(CreateSudokuActivity.this, "Verifying...", Toast.LENGTH_SHORT).show();
+        GameType gameType = gameController.getGameType();
+        int boardSize = gameType.getSize() * gameType.getSize();
+        QQWing verifier = new QQWing(gameType, GameDifficulty.Unspecified);
+
+        GameInfoContainer container = new GameInfoContainer(0, GameDifficulty.Unspecified,
+                gameType, new int [boardSize], new int [boardSize], new boolean [boardSize][gameType.getSize()]);
+        container.parseFixedValues(gameController.getCodeOfField());
+
+        verifier.setRecordHistory(true);
+        verifier.setPuzzle(container.getFixedValues());
+        boolean solvable = verifier.solve();
+
+        if(solvable) {
+            Toast.makeText(CreateSudokuActivity.this, "Done verifying!", Toast.LENGTH_SHORT).show();
+        } else {
+            Toast.makeText(CreateSudokuActivity.this, "Your sudoku cannot be solved!", Toast.LENGTH_LONG).show();
+        }
+
+    }
 }