void setup()
{
	//Initialisations
	Serial.begin(115200); //Serial Tx

	//Pin Modes
	pinMode(5, OUTPUT); //Relay 1   // BOOKS magnets 
	pinMode(6, OUTPUT); //Relay 2   // DOOR

	pinMode(A4, INPUT_PULLUP);  //REED Switch 1
	pinMode(A1, INPUT_PULLUP);  //REED Switch 2
	pinMode(A2, INPUT_PULLUP);  //REED Switch 3
	pinMode(A3, INPUT_PULLUP);  //REED Switch 4
	pinMode(A0, INPUT_PULLUP);  //All Wrong REED Switchs are connected in series
}

void loop()
{

   startover:
  digitalWrite(6, LOW);   //DOOR IS LOCKED
  digitalWrite(5, HIGH);   //BOOKS are reset to position
  delay(1000);
  digitalWrite(5, LOW);   //BOOKS Magnet is Active

Serial.println("Start the game");
    //-------------------------- The First book @ A0---------------------------
    for(;;){
	    if(digitalRead(A1)==HIGH)    // Sensing the Reed switch if LOW then it will test if its the right sequesnce 
	    {
          Serial.println("A1 is ON");
	        delay(2000);              //Delay 2 sec
          break;
	      }
	      else if (digitalRead(A0)==HIGH || digitalRead(A2)==HIGH || digitalRead(A3)==HIGH || digitalRead(A4)==HIGH) {                    //RESET ALL RELAYS if this book picked unsequenced

          Serial.println("RESET from A0");
	        digitalWrite(5,HIGH);
	        delay(1000); 
          goto startover;
	      }
	    }
    
  //-------------------------- The Second book @ A1---------------------------
  for(;;){
	     if(digitalRead(A2)==HIGH)   // Sensing the Reed switch if LOW then it will test if its the right sequesnce 
	    {

          Serial.println("A2 is ON");
	        delay(2000);                //Delay 2 sec
          break;
	      }
	      else if (digitalRead(A0)==HIGH || digitalRead(A3)==HIGH || digitalRead(A4)==HIGH){                       //RESET ALL RELAYS if this book picked unsequenced 
	        Serial.println("RESET from A1");
          digitalWrite(5,HIGH);
	        delay(1000); 
          goto startover;
	      }
	    }
  
      //-------------------------- The Third book @ A2---------------------------
      for(;;){
	     if(digitalRead(A3)==HIGH)   // Sensing the Reed switch if LOW then it will test if its the right sequesnce       
	    {
          Serial.println("A3 is ON");
	        delay(2000);                //Delay 2 sec
          break;
	      }
	      else if (digitalRead(A0)==HIGH || digitalRead(A4)==HIGH) {                        //RESET ALL RELAYS if this book picked unsequenced 

          Serial.println("RESET from A2");
	        digitalWrite(5,HIGH);
	        delay(1000); 
         goto startover;
	      }
	    }
      
      //--------------------FINAL ANSWER -- The Fourth book @ A3---------------------------
      for(;;){
	     if(digitalRead(A4)==HIGH)   // Sensing the Reed switch if LOW then it will test if its the right sequesnce 
	    {
	        delay(2000);                  //Delay 2 sec
          Serial.println("A4 is ON");
          Serial.println("DOOR OPEN");
          digitalWrite(6, HIGH);
          delay(2000);
          break;
	      }
	      else if (digitalRead(A0)==HIGH) {                        //RESET ALL RELAYS if this book picked unsequenced 

          Serial.println("RESET from A3");
	        digitalWrite(5,HIGH);
	        delay(1000); 
          goto startover;
	      }
	    }
      }