How to make a coundown of destroyed objects ?

1.-u need an empty game object with an script attached to count to 0 and to display ur text. 2.-u need a GUIText on ur screen. 3.-u need a the script to destroy ur balls.

so based on what u already have.

make an empty gameobject leve it anywhere. t$$anonymous$$s will only hold the previous mentioned script so it wont get destroyed and stop working.

1st script: name it whatever u want ill name it "GUIsphere"

 //1st declare a variable to hold ur GUIText and controll its properties and ur cont variable
 
 var referenceToText : GUIText;
 var number : int;
 //remember to assign the guitext on the inspector tab
 //then in the update call the referenceToText and the number and printit every Update
 void Update(){
     referenceToText.Text = ("Spheres left:"+number);
 }
 
 then on ur script where u destroy each ball. just add the following line 
 
 GameObject.Find("emptyGameobject").GetComponent("GUIsphere").number -=1;
 
 //emptyGameobject is the name of the empty gameobject that holds the GUI script