const int green=8;
const int yellow=13;
const int red=12;
const int btn=7;

int score=0;
int game_over=0;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(green, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(btn, INPUT_PULLUP);
  randomSeed(analogRead(0));

  digitalWrite(yellow, HIGH);
  delay(500);
  digitalWrite(yellow, LOW);
  delay(500);
  digitalWrite(yellow, HIGH);
  delay(250);
  digitalWrite(yellow, LOW);
  delay(250);
  digitalWrite(green, HIGH);
  digitalWrite(yellow, HIGH);
  digitalWrite(red, HIGH);
  delay(1000);
  digitalWrite(green, LOW);
  digitalWrite(yellow, LOW);
  digitalWrite(red, LOW);
  delay(10);

  start:
  digitalWrite(red, HIGH);
  int random_number = random(1000, 5000);
  delay(random_number);
  if(digitalRead(btn) == LOW){
    Serial.println("Zu früh!");
    Serial.println("Game Over!");
    digitalWrite(green, LOW);
    digitalWrite(yellow, HIGH);
    digitalWrite(red, LOW);    
    delay(50);
    exit(0);    
  }
  digitalWrite(red, LOW);
  digitalWrite(green, HIGH);
  delay(300);
  if(digitalRead(btn) == LOW){
    score++;
  } else {
    Serial.println("Zu Langsam!");
    Serial.println("Game Over!");
    digitalWrite(green, LOW);
    digitalWrite(yellow, HIGH);
    digitalWrite(red, LOW);    
    delay(50);
    exit(0);
  }
  if(score == 5){
    Serial.print("Score:");
    Serial.println(score);
    Serial.println("Gewonnen!");
    Serial.println("Herzlichen Glückwunsch!");
    digitalWrite(green, HIGH);
    digitalWrite(yellow, HIGH);
    digitalWrite(red, HIGH);
    delay("50");
    exit(0);
  }
  if(game_over == 0){
    Serial.print("Score:");
    Serial.println(score);
    digitalWrite(green, LOW);
    digitalWrite(yellow, LOW);
    digitalWrite(red, LOW);    
    goto start;
  }
  digitalWrite(green, LOW);
  digitalWrite(yellow, LOW);
  digitalWrite(red, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("Wenn man das hier lesen kann funzt irgendwas ned!");
}