int firstButton = 2;
int secondButton = 3;
int thirdButton = 4;
int fourthButton = 5;

unsigned long startMillis;
unsigned long currentMillis;
const unsigned long period = 1000;

void setup() {

const int redLEDPin = 10;
const int greenLEDPin = 9;

const int secondGreenLEDPin = 11;
const int secondRedLEDPin = 12;

const int thirdGreenLEDPin = 8;
const int thirdRedLEDPin = 13;

const int fourthRedLEDPin = 6;
const int fourthGreenLEDPin = 7;

pinMode(9, OUTPUT); // First blue light
pinMode(10, OUTPUT); // first green light
pinMode(2, INPUT); // first button

pinMode(12, OUTPUT); // second green light
pinMode(11, OUTPUT); // second blue light
pinMode(3, INPUT); // Second button

pinMode(13, OUTPUT); // third green light
pinMode(8, OUTPUT); // third blue light
pinMode(4, INPUT); // Third button

pinMode(6, OUTPUT); // Fourth green light
pinMode(7, OUTPUT); // Fourth blue light
pinMode(5, INPUT); // fourth button

pinMode(1, OUTPUT); // Sound

}



void loop() {

  int whichLight(random(1,5));
  int currentMillis = millis();

if (whichLight == 1) {
  firstButton = digitalRead(2);
  int lightOne(random(1, 3));
  if (lightOne == 1) {
    digitalWrite(10, HIGH); // first green light
  }
  else {
    digitalWrite(9, HIGH); // first blue light
    tone(1, 880, 50);
  }
  if (firstButton == HIGH) {
    digitalWrite(10, LOW);
    delay(150);
  }
delay(1000);
digitalWrite(10, LOW);
digitalWrite(9, LOW);
delay(50);
}


else if (whichLight == 2) {
  secondButton = digitalRead(3);
  int lightSecond(random(1, 3));
  if (lightSecond == 1) {
    digitalWrite(12, HIGH); // second green light
    }
  else {
    digitalWrite(11, HIGH); // second blue light
    tone(1, 880, 50);
  }
  if (secondButton == HIGH) {
    digitalWrite(12, LOW);
    delay(150);
  }

delay(1000);
digitalWrite(12, LOW);
digitalWrite(11, LOW);
delay(50);
}


else if (whichLight == 3) {
  thirdButton = digitalRead(4);
  int lightThird(random(1, 3));
  if (lightThird == 1) {
    digitalWrite(13, HIGH); // third green light
  }
  else {
    digitalWrite(8, HIGH); // third blue light
    tone(1, 880, 50);
  }
  if (thirdButton == HIGH) {
    digitalWrite(13, LOW);
    delay(150);
  }

delay(1000);
digitalWrite(13, LOW);
digitalWrite(8, LOW);
delay(50);
}


else if(whichLight == 4) {
  fourthButton = digitalRead(5);
  int lightFourth(random(1, 3));
  if (lightFourth == 1){
    digitalWrite(6, HIGH); // fourth green light
  }
  else {
    digitalWrite(7, HIGH); // fourth blue light
    tone(1, 880, 50);
  }
  if (fourthButton == HIGH) {
    digitalWrite(6, LOW);
    delay(150);
  }
delay(1000);
digitalWrite(7, LOW);
digitalWrite(6, LOW);
delay(50);

}
}