void setup(){
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  pinMode(7,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(12,INPUT);
}

int led[7]={2,3,4,5,6,7,8};
int pos=0;
bool forwards=true;
int lvl=1;

void blinklol(int lostPin){
  for (int i=0;i<7;i++){
    digitalWrite(led[lostPin],HIGH);
    delay(100);
    digitalWrite(led[lostPin],LOW);
    delay(100);
  }
  if (lostPin==3){
    lvl++;
  }else{
    int score=lvl-1;
    lvl=1;
    pos=0;
    forwards=true;
    for (int i=0;i<7;i++){
      if (score>=pow(2,(6-i))){
        score=score-pow(2,(6-i));
        digitalWrite(led[6-i],HIGH);
      }
    }
    while (!(digitalRead(12))){
      delay(10);
    }
    for (int i=0;i<7;i++){
      digitalWrite(led[i],LOW);
    }
    delay(500);
  }
}

void loop(){
  if ((pos==0 && !forwards)||(pos==6 && forwards)){
    forwards=!forwards;
  }
  if (forwards){
    pos++;
  }else{
    pos--;
  }
  digitalWrite(led[pos],HIGH);
  long temp=micros();
  while (true){
    if (digitalRead(12)){blinklol(pos);};
    if ((micros()-temp)>(1000000/lvl)){break;}
  }
  digitalWrite(led[pos],LOW);
}