     int row = getRow(index);
     int col = getCol(index);
     setColor(row, col, BLUE);  // Victory! Make everything blue.
+  }
+}
+
+void sendRedLightsMessage() {
+  if (USE_SERIAL) {
+    Serial.println(10);  // Send "Ahhhhhh!" audio signal.
+  }
+}
+
+void sendBadLightsMessage() {
+  if (USE_SERIAL) {
+    Serial.println(11);  // Send "I don't like the lights." audio signal.
   }
 }
 

  delay(10);
}


      }
    }
  }
  
  bool victory = !anyInvalid && !anyEmpty && !anyWallConstrainsViolated;

  if (!anyEmpty && !victory) { // Board is full but incorrect.
    sendBadLightsMessage();  // Send "I don't like the lights." audio signal.
  }

  
  return victory;
}

