int tempo = 600;
int nivel = 0;

void setup() {
  Serial.begin(9600);
  pinMode(13, INPUT);

  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);

  Serial.print("Nivel-> ");
  Serial.println(nivel);
}

void loop() {
  for(int x = 2; x <= 12; x++){
    digitalWrite(x, HIGH);
    delay(tempo);

    if(digitalRead(13)==1){
      while(digitalRead(13));
        if(x==7){
        nivel = nivel+1;
        Serial.print("Nivel-> ");
        Serial.println(nivel);
        tempo = tempo - 100;
        } else{
        Serial.println("GAME OVER");
        game_over();
        tempo = 600;
        x = 2;
        nivel = 0;
        Serial.print("Nivel-> ");
        Serial.println(nivel);
    }
  }

  digitalWrite(x, LOW);
  }

  for(int x = 12; x >= 2; x--){
    digitalWrite(x, HIGH);
    delay(tempo);
    digitalWrite(x, LOW);

    if(digitalRead(13)==1){
      while(digitalRead(13));
        if(x == 7){
          nivel = nivel+1;
          Serial.print("Nivel-> ");
          Serial.println(nivel);
          tempo = tempo - 100;
      } else{
          Serial.println("GAME OVER");
          game_over();
          tempo = 600;
          x = 12;
          nivel = 0;
          Serial.print("Nivel-> ");
          Serial.println(nivel);
      }
    }

    digitalWrite(x, LOW);
  }
}

void game_over()
{
  for(int j = 0; j < 4; j++)
    for(int x = 2; x <= 12; x++){
      digitalWrite(x, HIGH);
      digitalWrite(14 - x, HIGH);
      delay(100);
      digitalWrite(x, LOW);
      digitalWrite(14 - x, LOW);
    }
}