How to keep track of 100Ball shaped sprites

Hi,
I am in the process of making a 100 balls game on Android. I need to be able to track the game object count, so when the 100 balls all get destroyed by a 2Dcollision trigger, the game is over.

My issue is that i`m unable to find a specific answer.
I was told to either use a list or Array, but the tuts on offer ain’t very helpful, any help would be fantastic.

Thankyou.

Give all your balls the same tag…a tag that only appears on the balls. Then after you Instantiate() the balls, you can do:

 if (GameObject.FindWithTag("YourTag") == null) {
      Debug.Log("All the balls destroyed");
      // Game end code goes here
 }