Example WMC

using UnityEngine;
using UnityEngine.UI;
using System;
using UnityEngine.SceneManagement;

public class MenuPrincipal : MonoBehaviour
{
    // []:mundo {}:nivel ():nivel enumeracion completa

    private Slider musicaSlider;
    private Slider SFXSlider;
    private AudioSource musica;
    private SpriteRenderer negMusica;    
    private SpriteRenderer negSFX;

    public GameObject creditos;

    public Color fondoNormal;
    public Color fondoMundo1;
    public Color fondoMundo2;
    public Color fondoMundo3;
    public Color fondoMundo4;
    public Color fondoMundo5;
    public Image fondo;

    public GameObject disabledMusicImage;
    public GameObject disabledSFXImage;

    private bool checkedMusic = false;

    // Use this for initialization
    void Start()
    {

        if (PlayerPrefs.GetInt("GG") == 1)
        {
            GameObject.Find("Principal").SetActive(false);
            creditos.SetActive(true);
            PlayerPrefs.SetInt("GG", 0);
        }

      

    }

    // Update is called once per frame

    void Update()
    {
        if (!checkedMusic)
        {
            try
            {
                checkSounds();
                musica = Musica.GetMusica().GetComponent<AudioSource>();
                musica.volume = PlayerPrefs.GetFloat("VolumenMusica");
                //musica.Play();
            }
            catch (Exception)
            {

            }
            checkedMusic = true;

        }
    }
    
	public void FirstTimePlay() //Se encarga de empezar en el primer nivel para un noob
	{
		//string IsPlayerNew = PlayerPrefs.GetString ("IsPlayerNew");
		//if (IsPlayerNew == "true") 
		//{
		//	LoadScene ("Level [1] {1} (1)");
		//	PlayerPrefs.SetString("IsPlayerNew","false");
		//}
	}
    
    public void LoadLevel() //Carga nivel input
    {
        Debug.Log(transform.name);
    }

    public void LoadScene(string input) // carga un scene
    {
        SceneManager.LoadScene(input);
    }

    public void QuitGame() { Application.Quit(); } //Salir del juego

    public void ResetPlayer()
    {
        PlayerPrefs.DeleteAll();

    } //Reset de playerprefs
	
	private string getBetween(string strSource, string strStart, string strEnd) //Ohhh, si...
	{
		int Start, End;
		if (strSource.Contains(strStart) && strSource.Contains(strEnd))
		{
			Start = strSource.IndexOf(strStart, 0) + strStart.Length;
			End = strSource.IndexOf(strEnd, Start);
			return strSource.Substring(Start, End - Start);
		}
		else
		{
			return "";
		}
	}

    public void changeColorFondo(string mundo)
    {
        switch (mundo)
        {
            //case "normal":
            //    fondo.color = fondoNormal;
            //    break;
            //case "1":
            //    fondo.color = fondoMundo1;
            //    break;
            //case "2":
            //    fondo.color = fondoMundo2;
            //    break;
            //case "3":
            //    fondo.color = fondoMundo3;
            //    break;
            //case "4":
            //    fondo.color = fondoMundo4;
            //    break;
            //case "5":
            //    fondo.color = fondoMundo5;
            //    break;
            //default:
            //    break;
        }
    }

    public void adjustMusic()
    {
        string volumen = PlayerPrefs.GetString("musicaEnabled");

        if (volumen == "false")
        {
            disabledMusicImage.SetActive(false);
            PlayerPrefs.SetFloat("VolumenMusica", 1f);
            PlayerPrefs.SetString("musicaEnabled", "true");
            checkVolume();
        }
        if (volumen == "true")
        {
            disabledMusicImage.SetActive(true);
            PlayerPrefs.SetFloat("VolumenMusica", 0f);
            PlayerPrefs.SetString("musicaEnabled", "false");
            checkVolume();
        }
    }

    public void adjustSFX()
    {
        string volumen = PlayerPrefs.GetString("SFXEnabled");

        if (volumen == "false")
        {
            disabledSFXImage.SetActive(false);
            PlayerPrefs.SetFloat("VolumenSFX", 1f);
            PlayerPrefs.SetString("SFXEnabled", "true");
            checkVolume();
        }
        if (volumen == "true")
        {
            disabledSFXImage.SetActive(true);
            PlayerPrefs.SetFloat("VolumenSFX", 0f);
            PlayerPrefs.SetString("SFXEnabled", "false");
            checkVolume();
        }
    }

    public void checkSounds()
    {
        string volumenMusica = PlayerPrefs.GetString("musicaEnabled");

        if (volumenMusica == "false")
        {
            disabledMusicImage.SetActive(true);
        }
        if (volumenMusica == "true")
        {
            disabledMusicImage.SetActive(false);
        }


        string volumenSFX = PlayerPrefs.GetString("SFXEnabled");

        if (volumenSFX == "false")
        {
            disabledSFXImage.SetActive(true);
        }
        if (volumenSFX == "true")
        {
            disabledSFXImage.SetActive(false);
        }
    }

    private void checkVolume()
    {
        musica.volume = PlayerPrefs.GetFloat("VolumenMusica");
    }


}