Changing Level

Sorry about not being clear about the last quesstion so lets try this again.
So in my game you need to destroy turrents and i want to know how to make a script that will change the level when i have destryed all thhe turrents.

A simple way to do that is to create an empty object (let’s call it “Enemies”) and child all turrets to it. Check transform.childCount in the “Enemies” script Update function: when it’s zero, load the next level - something like this (empty object script):

var nextLevel: String; // set the next level name here in the Inspector

function Update(){
  if (transform.childCount == 0){
    Application.LoadLevel(nextLevel);
  }
}

Here is another example:

//This code is untested, please click the thumbs up if I helped you
//Make sure you write the name of the next level.

var turret : GameObject;
var levelName : String;

function Update () {
     if (GameObject.Find(turret) != null) {
         Application.LoadLevel(levelName);
     }
}