title: Some Android Unity Games can't support mouse click?
body: <p>On Android, I found some Unity Games can not support mouse click(e.g. com.defiantdev.skisafari), I can move mouse cursor, but buttons don't response when I click them. But most games can support mouse. I can use mouse click buttons like finger touch. </p>
  
  <p>I am not familiar with Unity. So I am confused that why some games can not support mouse? Does Unity can not support mouse default? Developers need implements the function by themselves? </p>
  
  <p>If a game can not support mouse, Can I modify it to support easily?</p>
  
  <p>Thanks.</p>