Levels Question

[Gusgip]

This level unlocking thing is really racking my brain. Last thing I like to do is ask for help.

My problem:
Staring the game, all my levels are locked except for Level 1. Which is obviously great. So I start level 1, which the object of the level is to gather 4 "soul fragments' to move to the next level. The script works and once 4 fragments are gathered it moves you to the next level. The problem is it not only unlocks level 2, but also unlocks levels 3 & 4. Clearing level 2, unlocks level 5, etc. So I'm assuming its unlocking 4 levels up from the current level you're on.

    using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    using TMPro;
    using UnityEngine.SceneManagement;
  
  
    public class SFCollected : MonoBehaviour
    {
        private int fragments = 0;
        public int nextSceneLoad;
  
        [SerializeField] private TextMeshProUGUI fragmentsText;
  
        void Start()
        {
            nextSceneLoad = SceneManager.GetActiveScene().buildIndex + 1;
        }
  
        private void OnTriggerEnter2D(Collider2D collision)
        {
            if (collision.gameObject.CompareTag("Fragment"))
            {
                Destroy(collision.gameObject);
                fragments++;
                fragmentsText.text = "x " + fragments;
            }
  
            if (fragments is 4)
            {
                SceneManager.LoadScene(nextSceneLoad);
  
                if(nextSceneLoad > PlayerPrefs.GetInt("levelsUnlocked"))
                {
                    PlayerPrefs.SetInt("levelsUnlocked", nextSceneLoad);
                }
            }
        }
    }

    using System.Collections;
    using System.Collections.Generic;
    using UnityEngine;
    using UnityEngine.UI;
    using UnityEngine.SceneManagement;
  
  
    public class LevelManager : MonoBehaviour
    {
        int levelsUnlocked;
        public SceneFader fader;
        public Button[] buttons;
  
        void Start()
        {
            levelsUnlocked = PlayerPrefs.GetInt("levelsUnlocked", 1);
  
            for (int i = 0; i < buttons.Length; i++)
            {
                buttons[i].interactable = false;
            }
  
            for (int i = 0; i < levelsUnlocked; i++)
            {
                buttons[i].interactable = true;
            }
        }
  
        public void LoadLevel(int levelIndex)
        {
            SceneManager.LoadScene(levelIndex);
        }
  
        public void Select (string levelName)
        {
            fader.FadeTo(levelName);
        }
  
    }

Help is greatly appreciated!

 

[Skydiver]

Set a breakpoint on this line:

nextSceneLoad = SceneManager.GetActiveScene().buildIndex + 1;

After the line executes inspect the value of nextSceneLoad. What is the value you are seeing? Is that the expected value?

I would expect the value to be 2. If the value is 5, then that would explain why levels 2, 3, and 4 are being unlocked.

Next set a breakpoint on the following line:

SceneManager.LoadScene(nextSceneLoad);

Again inspect the value of nextSceneLoad. Is that the expected value? Did the value change from the previous breakpoint? If the value changed from the previous breakpoint, you likely have some other code that is modifying this public field and that is the code that is unexpectedly unlocking the other levels.