int led = 9;
int ledState = LOW;
int button = 2;
int potPin = A0;

int minimum = random(1, 824);
int maximum = minimum + 200;

unsigned long previousTime = 0;
const long wait = 1000;
bool lastState = HIGH;
bool gameOverLight = false;

void setup()
{
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLUP);
}

void loop() 
{
  unsigned long currentTime = millis();
  int knobValue = analogRead(potPin);
  int buttonState = digitalRead(button);

  if (buttonState == LOW && lastState == HIGH)
  {
    if (knobValue >= minimum && knobValue <= maximum)
    {
      Serial.println("Correct! Change your answer to play again.");

      for (int i = 0; i < 3; i++)
      {
        previousTime = currentTime;
        ledState = HIGH;
        digitalWrite(led, ledState);
        delay(250);
        ledState = LOW;
        digitalWrite(led, ledState);
        delay(250);
      }

      minimum = random(1, 824);
      maximum = minimum + 200;
    }
    else
    {
      Serial.println("Incorrect... Change your answer to play again.");
    } 
  }
  lastState = buttonState;
}