Scene Loader in Unity

For loading scenes:

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using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.SceneManagement;   public class SceneLoader : MonoBehaviour {     [SerializeField] int startScene = 0;       public void LoadNextScene()     {         int currentSceneIndex = SceneManager.GetActiveScene().buildIndex;         SceneManager.LoadScene(currentSceneIndex + 1);     }       public void ReturnStartScene()     {         SceneManager.LoadScene(startScene);     }       public void QuitGame()     {         Application.Quit();     }       public void LoadGameOver()     {         SceneManager.LoadScene(2);     } }