Unlockable Levels - Object Masking

Hello. This is my first post so plz excuse any mistakes. So, I have been trying to develop an Unlockable Level System. I've made lots of scripts but I can't seem to find out why it doesn't work. Here is what I have:

This loads the level at the level menu and then sets the room number for the try again feature.

Levelselecter.js

 public static var room: int = 1;
 var particle : GameObject;
 var rayCastHit : RaycastHit;
 var ray : Ray;
 
     function Update () {
         
             if(Input.GetMouseButtonDown(0))
             {
                 ray = Camera.main.ScreenPointToRay (Input.mousePosition);
                 
                 if (Physics.Raycast (ray, rayCastHit))
                 {
                      if(rayCastHit.transform.name == "Cos1")
                     {
                     room =1;
                     Application.LoadLevel("Cosmos1");
                     
                     
                     }
                     
                     else if(rayCastHit.transform.name == "Cos2")
                     {
                     
                     room =2;
                     Application.LoadLevel("Cosmos2");
                     
                     
                     }
                     
                     else if(rayCastHit.transform.name == "Cos3")
                     {
                     Application.LoadLevel("Cosmos3");
                     room = 3;
                     
                     }
 //ETC to 20

Next, when the ball in the Level hits the portal to get to win the level it checks if the level the player was on was won for the first time (by making the UCosmos (Unlockedlevels variable) increased if the unlocked level is = to the room) and then sending the player back to the level menu to see the new unlocked level:

Ball.js

 var Crackle : GameObject;
 var Pong : AudioClip;
 public static var UCosmos: int = 1; //UCosmos is the variable that saves the number of Unlocked Levels in my pack Cosmos
 
 
 function Awake()
 {
 rigidbody.AddForce(0, -4, 0, ForceMode.Impulse);
 
 }
 
 function Update(){
 
 if(transform.position.y < -5){
 Application.LoadLevel("TryAgain");
 }}
 
 function OnCollisionEnter(theCollision : Collision){
 
 
 
 if(theCollision.gameObject.name == "Portal Cosmos"){
 rigidbody.velocity=Vector3.zero;
 rigidbody.angularVelocity=Vector3.zero;
 
 
 if(Levelselecter.room==1){
 if(UCosmos == 1){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==19){
 if(UCosmos == 19){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==18){
 if(UCosmos == 18){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==17){
 if(UCosmos == 17){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==16){
 if(UCosmos == 16){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==15){
 if(UCosmos == 15){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==14){
 if(UCosmos == 14){
 UCosmos += 1;
 }}
 
 
 else if(Levelselecter.room==13){
 if(UCosmos == 13){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==12){
 if(UCosmos == 12){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==11){
 if(UCosmos == 11){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==10){
 if(UCosmos == 10){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==9){
 if(UCosmos == 9){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==8){
 if(UCosmos == 8){
 UCosmos += 1;
 }}
 
 
 else if(Levelselecter.room==7){
 if(UCosmos == 7){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==6){
 if(UCosmos == 6){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==5){
 if(UCosmos == 5){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==4){
 if(UCosmos == 4){
 UCosmos += 1;
 }}
 
 else if(Levelselecter.room==3){
 if(UCosmos == 3){
 UCosmos += 1;
 }}
 
 
 else if(Levelselecter.room==2){
 if(UCosmos == 2){
 UCosmos += 1;
 }
 }
 else if(Levelselecter.room==20){
 if(UCosmos == 20){
 UCosmos += 1;
 }
 }
 Application.LoadLevel("Cosmos Levels");
 }
 audio.Play();
 Instantiate (Crackle, transform.position, transform.rotation);
 }`

 

So on the level selection page, there are all the level boxes. On everyone but lv 1, there is a black box called Cost.. (Cost2 goes on Cos2,etc). When the level was completed, I tries making it so that the UCosmos destroys the Cost blocks like so:

 var Cost20 : GameObject;
     var Cost19 : GameObject;
     var Cost18 : GameObject;
     var Cost17 : GameObject;
     var Cost16 : GameObject;
     var Cost15 : GameObject;
     var Cost14 : GameObject;
     var Cost13 : GameObject;
     var Cost12 : GameObject;
     var Cost11 : GameObject;
     var Cost10 : GameObject;
     var Cost9 : GameObject;
     var Cost8 : GameObject;
     var Cost7 : GameObject;
     var Cost6 : GameObject;
     var Cost5 : GameObject;
     var Cost4 : GameObject;
     var Cost3 : GameObject;
     var Cost2 : GameObject;
 
 
 function Update(){
 if(Ball.UCosmos == 2){
 Destroy(Cost2);
 }
 else if(Ball.UCosmos == 3){
 Destroy(Cost3);
 }
 else if(Ball.UCosmos == 4)
 {Destroy(Cost4);}
 else if(Ball.UCosmos >= 5)
 {Destroy(Cost5);}
 else if(Ball.UCosmos >= 6)
 {Destroy(Cost6);}
 else if(Ball.UCosmos >= 7)
 {Destroy(Cost7);}
 else if(Ball.UCosmos >= 8)
 {Destroy(Cost8);}
 else if(Ball.UCosmos >= 9)
 {Destroy(Cost9);}
 else if(Ball.UCosmos >= 10)
 {Destroy(Cost10);}
 else if(Ball.UCosmos >= 11)
 {Destroy(Cost11);}
 else if(Ball.UCosmos >= 12)
 {Destroy(Cost12);}
 else if(Ball.UCosmos >= 13)
 {Destroy(Cost13);}
 else if(Ball.UCosmos >= 14)
 {Destroy(Cost14);}
 else if(Ball.UCosmos >= 15)
 {Destroy(Cost15);}
 else if(Ball.UCosmos >= 16)
 {Destroy(Cost16);}
 else if(Ball.UCosmos >= 17)
 {Destroy(Cost17);}
 else if(Ball.UCosmos >= 18)
 {Destroy(Cost18);}
 else if(Ball.UCosmos >= 19)
 {Destroy(Cost19);}
 else if(Ball.UCosmos >= 20)
 {Destroy(Cost20);}
 }

The Problem is that it doesn't destroy the Cost blocks. Help?!?!??!?