GameControl

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

public class GameControl : MonoBehaviour
{
    public static GameControl instance; //to make function be accessible from other class.
    public GameObject gameOverMenu, playBtn, pauseBtn;
    public Text scoreText, bestScore, gameOverText, scoreTextB;
    public bool gameOver = false;
    public float scrollSpeedLand = -1.25f;
    public float scrollSpeedBg = -0.0625f;
    public float scrollSpeedCloud = -0.0125f;
    private int score = 0;

    private bool paused = false;
    private bool mainMenu, restart = false;

    void Start()
    {
        playBtn.gameObject.SetActive(false);
        pauseBtn.gameObject.SetActive(true);
    }

    void Awake()
    {
        //if start game and find no instance of gameControl, then this is the instance
        if (instance == null)
            instance = this;
        else if (instance != this)
            Destroy(gameObject);
    }

    public void BirdDied()
    {
        gameOverMenu.gameObject.SetActive(true);
        pauseBtn.gameObject.SetActive(false);
        gameOverText.text = "Game Over";
        gameOver = true;

        if (score > Main.instance.GetHighScore())
        {
            Main.instance.SetHighScore(score);
        }
        scoreText.gameObject.SetActive(false);

        scoreTextB.text = "" + score.ToString();
        bestScore.text = "" + Main.instance.GetHighScore();
    }

    public void BirdScored()
    {
        if (gameOver == true)
            return;
        else if (gameOver == false)
        {
            score++;
            scoreText.text = "Score: " + score.ToString();
        }
    }

    public void restartGame()
    {
        restart = true;
        if(gameOver == true && restart == true)
        {
            AdsManager.instance.showVideo();
        }
    }

    public void MainMenu()
    {
        mainMenu = true;
        if (gameOver == true && mainMenu == true)
        {
            AdsManager.instance.showVideo();
        }
    }

    public void LoadLevel()
    {
        if(gameOver == true && restart == true)
        {
            SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
        }
        else if(gameOver == true && mainMenu == true)
        {
            SceneManager.LoadScene("Main");
        }
    }

    public void pauseGame()
    {
        Time.timeScale = 0;
        paused = true;

        pauseBtn.gameObject.SetActive(false);
        playBtn.gameObject.SetActive(true);
    }

    public void continueGame()
    {
        if (paused == true)
        {
            Time.timeScale = 1;
            playBtn.gameObject.SetActive(false);
            pauseBtn.gameObject.SetActive(true);
        }
    }
}