Level unlock

I am new to unity and I have finished my first game, but I am stuck in level unlock system.
I have created this level unlock system, but the problem is whenever I have unlocked more than 2 or all the levels and I go back and play the first level, then all the other levels become locked again. Can anyone please help me.

Code (CSharp):

1. public int LeveltoUnlock = 2;
2.  
3.  
4.  
5. public void Levelwon()
6.     {
7.  
8.  
9.         PlayerPrefs.SetInt("levelReached", LeveltoUnlock);
10.        
11.  
12.  
13.  
14.     }

Code (CSharp):

1. public Button[] levelButtons;
2.  
3.     private void Start()
4.     {
5.         int levelReached = PlayerPrefs.GetInt("levelReached", 1);
6.  
7.         for (int i = 0; i < levelButtons.Length; i++)
8.         {
9.             if (i + 1  > levelReached)
10.  
11.             levelButtons[i].interactable = false;
12.         }
13.     }

 

That's because you're not storing the highest level reached; you're storing the last level finished (which you nonetheless call "levelReached").

To make your variable name accurate, you only want to change it to a higher value, never a lower one:

Code (CSharp):

1. public void Levelwon() {
2.      if (PlayerPrefs.GetInt("levelReached") < LeveltoUnlock) {
3.           PlayerPrefs.SetInt("levelReached", LeveltoUnlock);
4.      }
5. }

 

Deleted bogus poll. Please don't do that.
Moved to scripting.

Try to put in more effort when asking for help and you'll get better responses.

 

Thank you so much