Unpause game when the timer reaches 0

When the game scene opens, I would like it to be automatically paused and to start displaying a 3 second timer (3 2 1). Once the timer is less than 0, I would like the game to be unpaused so the user can start playing.

This is my code so far :). At the moment, it starts off paused but the timer doesn’t count down. Any ideas as to what I can do?

public class StartGame : MonoBehaviour {

public Text countdownText;
public float timer = 3.0f;

// Use this for initialization
void Start () {
    Time.timeScale = 0;

// Update is called once per frame
void Update () {
    timer -= Time.deltaTime;
    countdownText.text = (timer).ToString("0");

    if (timer < 0)
        Time.timeScale = 1;


If you set your timeScale to 0, the Time.deltaTime is scaled accordingly, so your timer won’t count down. Try using Time.unscaledDeltaTime instead.