title: TriggerEnter is not working for && operator in unity 2D
body: <p>I have craete 2 ball sprite &amp; one hole sprite, when this 2 ball sprite enters into the hole it need to load new scene.</p>
  
  <p>im trying to find multi collision with AND operator but it's not working,if i try with one condition it workes fine, i don't know why.</p>
  
  <pre><code>void OnTriggerEnter2D(Collider2D col)
  {
      if ((col.gameObject.tag == "ball2") &amp;&amp; (col.gameObject.tag == "ball")) {
          Application.LoadLevel("Main");
      }
  
  }
  </code></pre>