Raycast not working!!! help me please

Hi, my script is not working properly, Works only with one game object, but in my scene have a 40 cube's clone frefab. When I click on any cube all of the cubes moves and Spawn. Can you help me to fix it? I need to click in one of the cubes and this cube will move not the others. I put the script on a cube, and create 4 minor cube to "setas" gameobject cube has tagged "blocos" directional cubes has tagged "cima","direita","baixo","esquerda"

using UnityEngine;

 using System.Collections;
 
 public class regraBlocos : MonoBehaviour {
     
     private Vector3 selfSEtaPos1;
     private Vector3 selfSEtaPos2;
     private Vector3 selfSEtaPos3;
     private Vector3 selfSEtaPos4;
 
      static bool blocoAtivo = true;
      static bool blocoPressionado = false;
     public GameObject seta1;
     public GameObject seta2;
     public GameObject seta3;
     public GameObject seta4;
     
     // Use this for initialization
     void Start () {
     //    selfPosition = new Vector3(((transform.position.x)- (transform.position.x)), ((transform.position.y)- (transform.position.y)), ((transform.position.z)- (transform.position.z)));
         selfSEtaPos1 = new Vector3(((transform.position.x)+ (0)), ((transform.position.y)+ (0)), ((transform.position.z)+ (1)));
         selfSEtaPos2 = new Vector3(((transform.position.x)+ (1)), ((transform.position.y)+ (0)), ((transform.position.z)+ (0)));
         selfSEtaPos3 = new Vector3(((transform.position.x)- (0)), ((transform.position.y)+ (0)), ((transform.position.z)- (1)));
         selfSEtaPos4 = new Vector3(((transform.position.x)- (1)), ((transform.position.y)+ (0)), ((transform.position.z)- (0)));
 
     }
     //void SpawnSetas1() {// regra para spawnar as setas somente uma vez
     //      int pushing = 0;
     //    if (pushing == 0){
     //        Instantiate(seta1,selfSEtaPos1, Quaternion.identity);
     //        Instantiate(seta2,selfSEtaPos2, Quaternion.identity);
     //        Instantiate(seta3,selfSEtaPos3, Quaternion.identity);
     //        Instantiate(seta4,selfSEtaPos4, Quaternion.identity);
     //    }
     //    pushing = 1;}
 
 
     void Destroi_Setas(){// regra para destruir as setas quando nao e mais preciso
         //destroi seta 1
         //destroi seta 2
         //destroi seta 3
         //destroi seta 4
         }
 
 
 
     // Update is called once per frame
       void Update(){
 
   if (Input.GetMouseButtonDown(0) & blocoAtivo ==true)
     {
         RaycastHit hitInfo = new RaycastHit();
        bool hit = Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out hitInfo);
        if (hit) 
        {
          if (hitInfo.transform.gameObject.tag == "BLOCO" && blocoAtivo ==true)
                 {blocoPressionado = true;    
                             Instantiate(seta1,selfSEtaPos1, Quaternion.identity);
                             Instantiate(seta2,selfSEtaPos2, Quaternion.identity);
                             Instantiate(seta3,selfSEtaPos3, Quaternion.identity);
                             Instantiate(seta4,selfSEtaPos4, Quaternion.identity);;
                     Debug.Log(blocoPressionado);
                 } 
             
 
 
                 //regra se o ray colidir com as tags o bloco se move
               if (hitInfo.transform.gameObject.tag == "CIMA" & blocoAtivo ==true)
          {transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z + 1.0f);
                  blocoAtivo = false;
                     Destroi_Setas(); 
                     //por aqui e para os demais a regra de destruir setas
                 } 
 
                   if (hitInfo.transform.gameObject.tag == "DIREITA" & blocoAtivo ==true)
          {transform.position = new Vector3(transform.position.x + 1.0f, transform.position.y, transform.position.z);
                     blocoAtivo = false;
                     Destroi_Setas(); } 
                   if (hitInfo.transform.gameObject.tag == "BAIXO" & blocoAtivo ==true)
          {transform.position = new Vector3(transform.position.x, transform.position.y, transform.position.z - 1.0f);
                      blocoAtivo = false;
                     Destroi_Setas(); } 
                  if (hitInfo.transform.gameObject.tag == "ESQUERDA" & blocoAtivo ==true)
          {transform.position = new Vector3(transform.position.x - 1.0f, transform.position.y, transform.position.z );
                      blocoAtivo = false;
                     Destroi_Setas(); } 
             
 }
 }
 }
 }