Simon Game Help

I created a new function called playGame(), placing showSequence() and readSequence() in it. Everything works the way I want it to. Thanks for all the help!

#define A3  220 //Red tone
#define G4  392 //Yellow tone
#define C4  262 //Green tone

int sequence[100];
int largestIndex = 0;
int score = 0;
boolean gameOver = false;

void setup() {
  // put your setup code here, to run once:
  pinMode(16, OUTPUT);  //Red LED
  pinMode(14, OUTPUT);  //Yellow LED
  pinMode(13, OUTPUT);  //Green LED
  pinMode(12, OUTPUT);  //Speaker
  Serial.begin(115200);
}

void playGame()
{
  String gameSequence = "";
  sequence[largestIndex] = random(0, 3);
  largestIndex++;

  for (int index = 0; index < largestIndex; index++)
  {
    if (sequence[index] == 0)
    {
      delay(300);
      digitalWrite(16, HIGH);
      delay(650);
      tone(12, A3);
      delay(50);
      noTone(12);
      digitalWrite(16, LOW);
      gameSequence += "r";
    }

    if (sequence[index] == 1)
    {
      delay(300);
      digitalWrite(14, HIGH);
      delay(650);
      tone(12, G4);
      delay(50);
      noTone(12);
      digitalWrite(14, LOW);
      gameSequence += "y";
    }

    if (sequence[index] == 2)
    {
      delay(300);
      digitalWrite(13, HIGH);
      delay(650);
      tone(12, C4);
      delay(50);
      noTone(12);
      digitalWrite(13, LOW);
      gameSequence += "g";
    }
  }

  String userSequence = "";
  Serial.println("Repeat the sequence. Enter one char at a time (r for red, y for yellow, and g for green)");

  for (int index = 0; index < largestIndex; index++)
  {
    while (Serial.available() == 0) //check to see if something came in the serial port
    {

    }
    char a = Serial.read(); //if so, read it
    String led = String(a);
    Serial.println(a);
    userSequence += led;
  }

  if (userSequence.equals(gameSequence))
  {
    Serial.println("Correct!");
    score++;
  }
  else
  {
    String totalScore = String(score);
    Serial.println("Incorrect!");
    Serial.println("Your score is " + totalScore + "!");
    gameOver = true;
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  while (!gameOver)
  {
    playGame();
  }
}