Change scene automatically when all objects are clicked Unity

Question

I'm making a new game in Unity and I'm stuck in my script. I'm really noob in C# scripting. I'm already looking for all information but no luck. The game is very simple, it is 2D game where need just click on bubbles and they are rotating when are clicked. I will describe what I exactly need to create. I need a script when all objects are clicked then scene automatically changes to the next level + I need it to have a timeline, for example, for each level have 30 seconds to click all bubbles, when the time is over the game is over and a window pops up with a message "Game Over" and you can press the Reply and Exit buttons. I really hope that someone helps me. Thanks!

P.S. This is my script now for my gameObjects:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.SceneManagement;
public class pop : MonoBehaviour
{
    public AudioClip sound;
    AudioSource audio;


    // Start is called before the first frame update
    void Start()
    {
        audio = GetComponent<AudioSource>();
        

    }

    // Update is called once per frame
    void Update()
    {
        
    }

    bool wasClicked = false;


    private void OnMouseDown()
    {
        if (!wasClicked)
        {
            wasClicked = true;
            transform.Rotate(0, 0, 180);
            audio.PlayOneShot(sound);
  
        }

    }


}

Answer 1

You should separate these.

I would have a central manager for the scene change like e.g.

public class Manager : MonoBehaviour
{
    [SerializeField] private float timer = 30;

    private void Awake ()
    {
        // Register to an event we will add which is fired everytime 
        // a pop was clicked
        pop.onClicked += PopClicked;
    }

    private void OnDestroy ()
    {
        // Don't forget to remove the callback as soon as not needed anymore
        pop.onClicked -= PopClicked;
    }

    private void PopClicked ()
    {
        // Check if there is no Unclicked pop remaining
        if(pop.Unclicked.Count == 0)
        {
            // if so go to the next scene
            SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex + 1);
        }
    }

    private void Update ()
    {
        // Every Frame reduce the timer by the time passed since the last frame
        timer -= Time.deltaTime;
        // Maybe also update a timer display text here

        if(timer <= 0)
        {
            // if it reaches 0 -> GameOver scene
            SceneManager.LoadScene("GameOver");
        }
    }
}

And then modify your Pop class accordingly with some additional things:

public class pop : MonoBehaviour
{
    // Stores all Unclicked instances
    // As this is static it is "shared" between all instances or better said
    // it is part of the type itself 
    private static HashSet<pop> _unclicked = new HashSet<pop>();

    // Public readonly access
    public static HashSet<pop> Unclicked => new HashSet<pop>(_unclicked);

    // Event that is invoked everytime a pop is clicked
    public static event Action onClicked;

    public AudioClip sound;
    [SerializeField] AudioSource audio;

    void Awake()
    {
        if(!audio) audio = GetComponent<AudioSource>();
        
        // Add yourself to the collection of Unclicked instances
        _uncliked.Add(this);
    }

    private void OnDestroy ()
    {
        // Don't forget to also remove in case this is destroyed 
        // e.g. due to the scene change to GameOver
        if(_unclicked.Contains(this)) _unclicked.Remove(this);
    }

    private void OnMouseDown()
    {
        // Is this still Unclicked?
        if (!_unclicked.Contains(this)) return;
        
        transform.Rotate(0, 0, 180);
        audio.PlayOneShot(sound);
 
        // Remove yourself from the Unclicked instances
        _unclicked.Remove(this); 
        // Invoke the event
        onClicked?.Invoke();
    }
}