How to add pause screen with buttons

Question

I have recently finished the unity official youtube flappy bird tutorial. I want to give user the option that, after striking one of the columns he can watch a reward video and continue with his score. If he strikes a column again then again this screen will pop up. This screen will have two buttons - watch video or let it be game over. I dont know how to do this.

Following is my class:

 public class GameControl : MonoBehaviour
 {
     public float scrollspeed = -1.5f;
     public static GameControl instance;
     public GameObject gameOverText;
     public bool gameover = false;
     public Text scoretext;
     private int score = 0;
     void Awake()
     {
         if(instance == null)
         {
             instance = this;
         }
         else if (instance!=null)
         {
             Destroy(gameObject);
         }
     }
 
   
     void Update()
     {
         if (gameover == true && Input.GetMouseButtonDown (0))
         {
             SceneManager.LoadScene(SceneManager.GetActiveScene ().buildIndex);
         }
     }
 
     public void BirdScored()
     {
         if(gameover)
         {
             return;
         }
         score++;
         scoretext.text = "Score: " + score.ToString();
     }
 
     public void BirdDied()
     {
         gameOverText.SetActive(true);
         gameover = true;
 
     }
 }

This class takes care of the bird dying process. how can i add the option to watch add and continue the game here? Unity newbie here....

Answer 1

The code isnt tested but it should point you to the right direction.

 public GameObject newLifeUI; // this will be your plus life UI
     public GameObject gameOverUI; // game over UI is here
 
     bool conditionChange; // checking to see if he can have a chance to continue
 
     void Start()
     {
         newLifeUI.SetActive(false);
         gameOverUI.SetActive(false);
     }
 
     void Update()
     {
         if (!conditionChange && /*have another condition here to detect if the player dies or not*/) // if the user dies the first time, let him have the chance to live again
         {
             newLifeUI.SetActive(true);
 
             conditionChange = true;
         }
 
         if (conditionChange && /*have another condition here to detect if the player dies or not*/) // tough luck
         {
             gameOverUI.SetActive(true);
         }
     }
 
     public void WatchVideo()
     {
         // your ad code will be here
     }
 
     public void QuitGame()
     {
         // quit game code will be here
     }

How to add pause screen with buttons

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