Using points to unlock next scene in Unity

There are very clear issues with your script as in the error mentioned:

"Cannot implicitly convert type string to bool"

And this error has been generated by the "if" statement as it needed bool not a string, to fix it just remove the double quotes like this:

if (Score == 45)

also the same error has been casued by:

const int ScorePrefix = "Score:";

so you can remove this variable as it not used in this script or you can assign an int value to it. int is basically a number with no decimal point for example 1,2,10,489 etc. To read more about C# data types please visit here. or Here.

const int ScorePrefix = 10; //or any value which is int.*

Error # 2:

"The name 'Rust_Room' does not exist in the current context"

this is generated by this:

SceneManager.LoadScene(SceneManager.GetSceneByName(Rust_Room)().buildIndex + 1);

as you can see you are passing 'Rust_Room' is a 'type' while it needs name of the scene which is string.

So jut do it like this and it resolve the issue:

SceneManager.LoadScene(SceneManager.GetSceneByName("Rust_Room")().buildIndex + 1);

So the final script will be:

using System.Collections;
using System.Collections.Generic;
using UnityEngine.SceneManagement;

public class Example
{
    HUD hud;
    int points;

    const int ScorePrefix = 10; //or any value which is int.
    int score;

    public void LoadLevel()
    {
        if (Score == 45)
        {
             // load the nextlevel
             SceneManager.LoadScene(SceneManager.GetSceneByName("Rust_Room")().buildIndex + 1);
        }

    }
}

By the way i will handle this situation using build index instead of name here is how i will do it:

using System.Collections;
using System.Collections.Generic;
using UnityEngine.SceneManagement;

public class Example
{
    HUD hud;
    int points;

    const int ScorePrefix = 10; //or any value which is int.
    int score;

    public void LoadLevel()
    {
        if (Score==45)
        {
            int currentScene = SceneManager.GetActiveScene().buildIndex + 1;
            SceneManager.LoadScene(currentScene);
        }
    }
}

In this code i first get current scene index and then increment by 1 to get next scene index and finally loading scene with incremented index.

I hope this will help...