const int numLights = 9;  // number of lights in the circle
const int lightPins[numLights] = {13, 12, 11, 10, 9, 8, 7, 6, 5};  // pins for each light
const int buttonPin = 4;  // pin for button input
int currentLight = 0;  // current position of the lit light
bool buttonReleased = true;  // flag to track button release

void setup() {
  // set each light pin as an output
  for (int i = 0; i < numLights; i++) {
    pinMode(lightPins[i], OUTPUT);
  }
  
  // set button pin as an input
  pinMode(buttonPin, INPUT);
  Serial.begin(9600);
  Serial.println("Starting game");
}

void loop() {
  // turn off all lights
  for (int i = 0; i < numLights; i++) {
    digitalWrite(lightPins[i], LOW);
  }
  
  // turn on current light
  digitalWrite(lightPins[currentLight], HIGH);
  
  // check if button is pressed
  int buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH && buttonReleased) {
    // button was pressed, set flag to false
    buttonReleased = false;
    
    if (currentLight == 5) {
      // button was pressed at the right time, player wins
      Serial.println("You win!");
    }
  }
  else if (buttonState == LOW) {
    // button was released, set flag to true
    buttonReleased = true;
  }
  
  // update current light position
  currentLight = (currentLight + 1) % numLights;
  
  // delay for a certain time to control the speed of the lights
  delay(300);
}