1. Change Scene on Button Press
2. Change Scene on Collision
3. Switch scenes after time (delay)
4. How to Change Level (scene) AND Keep Your Variables
   

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The button script:

/*

   .-------.                             .--.    .-------.     .--.            .--.     .--.        
   |       |--.--.--------.-----.-----.--|  |    |_     _|--.--|  |_.-----.----|__|---.-|  |-----.
   |   -   |_   _|        |  _  |     |  _  |      |   | |  |  |   _|  _  |   _|  |  _  |  |__ --|
   |_______|__.__|__|__|__|_____|__|__|_____|      |___| |_____|____|_____|__| |__|___._|__|_____|
   © 2019 OXMOND / www.oxmond.com 

*/

using UnityEngine;
using UnityEngine.SceneManagement;

public class BtnClick : MonoBehaviour
{
    public void BtnNewScene()
    {
        PlayerPrefs.SetInt("score", 2500);
        SceneManager.LoadScene("Scene 2");
    }

}

The Ball Collision Script:

/*

   .-------.                             .--.    .-------.     .--.            .--.     .--.        
   |       |--.--.--------.-----.-----.--|  |    |_     _|--.--|  |_.-----.----|__|---.-|  |-----.
   |   -   |_   _|        |  _  |     |  _  |      |   | |  |  |   _|  _  |   _|  |  _  |  |__ --|
   |_______|__.__|__|__|__|_____|__|__|_____|      |___| |_____|____|_____|__| |__|___._|__|_____|
   © 2019 OXMOND / www.oxmond.com 

*/

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

public class BallCollision : MonoBehaviour
{
    private void OnCollisionEnter2D(Collision2D collision)
    {
        if (collision.gameObject.name == "Ball Red") {
            SceneManager.LoadScene("Scene 2");
        }
    }
}

The Delay Script:

/*

   .-------.                             .--.    .-------.     .--.            .--.     .--.        
   |       |--.--.--------.-----.-----.--|  |    |_     _|--.--|  |_.-----.----|__|---.-|  |-----.
   |   -   |_   _|        |  _  |     |  _  |      |   | |  |  |   _|  _  |   _|  |  _  |  |__ --|
   |_______|__.__|__|__|__|_____|__|__|_____|      |___| |_____|____|_____|__| |__|___._|__|_____|
   © 2019 OXMOND / www.oxmond.com 

*/

using UnityEngine;
using DG.Tweening;
using UnityEngine.SceneManagement;

public class Delay : MonoBehaviour
{
    void Start()
    {
        DOVirtual.DelayedCall(3, GotoNextScene);
    }

    void GotoNextScene()
    {
        SceneManager.LoadScene("Scene 2");
    }
}

The Load Variable (Scene 2) Script:

/*

   .-------.                             .--.    .-------.     .--.            .--.     .--.        
   |       |--.--.--------.-----.-----.--|  |    |_     _|--.--|  |_.-----.----|__|---.-|  |-----.
   |   -   |_   _|        |  _  |     |  _  |      |   | |  |  |   _|  _  |   _|  |  _  |  |__ --|
   |_______|__.__|__|__|__|_____|__|__|_____|      |___| |_____|____|_____|__| |__|___._|__|_____|
   © 2019 OXMOND / www.oxmond.com 

*/

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using TMPro;

public class Scene2 : MonoBehaviour
{

    public TextMeshPro scoreText;

    void Start()
    {
        scoreText.text = "Score: " + PlayerPrefs.GetInt("score").ToString();
    }

}

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