how to use codes to unlock games unity code example

Example: how to use codes to unlock games unity

using UnityEngine; using System.Collections;  public class Test : MonoBehaviour {      public string levelCode;     public bool isBlank;     public bool isWrongKey;      void OnGUI()     {          levelCode = GUI.TextField(new Rect(100, 100, 250, 30), levelCode);          GUI.Label(new Rect(200, 60, 300, 40), "Enter Level");          if (GUI.Button(new Rect(100,  140, 250, 30), "OK!"))          {             GetInput(levelCode);          }          if(isBlank)         {             GUI.Label(new Rect(200, 200, 300, 40), "Invalid Key!");         }          if(isWrongKey)         {             GUI.Label(new Rect(200, 200, 300, 40), "Wrong Key!");         }     }      public void GetInput (string guess)      {      if ((guess == "pass122") ||(guess == "pass133"))      {          Application.LoadLevel("Eat");           isBlank = false;          isWrongKey = false;         //Debug.Log("Load level Eat");      }       else if (guess == "")       {         isBlank = true;         isWrongKey = false;         Debug.Log("Invalid Key!");      }             else       {         isWrongKey = true;         isBlank = false;         Debug.Log("Wrong Key!");      } }  }