Play a sound

Questions & Answers
1

How can I play a sound when I left click.
I need a script or a tutorial plz.

2

See the related questions (now that the question contains real words).

3

In order to play a sound, you must add an AudioSource component to some game object. If you have only one sound to play, import the sound via Assets/Import New Asset… menu and drag it to the Audio Source Audio Clip field in the Inspector. Now you have the sound ready to play: just use the function audio.Play() in the script assigned to the game object and the sound will be played. If you want it to be played when the left button is clicked, use:

function Update(){

  if (Input.GetMouseButtonDown(0)){
    audio.Play();
  }
}

Read about audio in:

http://unity3d.com/support/documentation/ScriptReference/AudioSource.html

and about mouse and other input devices in:

http://unity3d.com/support/documentation/ScriptReference/Input.html