Scriptum/Assets/Scripts/SceneManager/OnMapAppearanceMethod.cs

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

// Tell what is the beginning state of loaded scene
public enum OnMapAppearanceMethodEnum
{
    NewGame = 0,
    LoadGame = 1,
    Gateway = 2
    //maybe respawn too
}

public enum GameStatus
{
    NewGame = 0,
    Continue = 1
}


public class OnMapAppearanceMethod : MonoBehaviour
{
    public static OnMapAppearanceMethodEnum Gateway { get; set; }    // Map status

    public static GameStatus GameStatus { get; set; }

    // every script which makes player appear somewhere should change this variable ! ! !

    void Awake()
    {
        if(GameStatus == null)
            GameStatus = GameStatus.NewGame;

        if(Gateway == null)
            Gateway = OnMapAppearanceMethodEnum.NewGame;
    }

    /// <summary>
    /// Set game global state as new game
    /// 
    /// Marked after pressing "New Game" on Main Menu
    /// </summary>
    public static void SetNewGameStatus()
    {
        GameStatus = GameStatus.NewGame;

        Gateway = OnMapAppearanceMethodEnum.NewGame;
    }

    /// <summary>
    /// Function to check if its new game
    /// </summary>
    /// <returns></returns>
    public static bool IsNewGame()
    {
        return GameStatus == GameStatus.NewGame;
    }

    /// <summary>
    /// Function to set game's global state as continued
    /// 
    /// Markes after pressing "Continue" in Main Menu
    /// 
    /// In this state we want to use previously saved game data
    /// </summary>
    public static void SetContinueStatus()
    {
        GameStatus = GameStatus.Continue;
    }

    /// <summary>
    /// Function to check if its continued game
    /// 
    /// In this state we want to use previously saved game data
    /// </summary>
    /// <returns></returns>
    public static bool IsContinue()
    {
        return GameStatus == GameStatus.Continue;
    }

    /// <summary>
    /// Function to set state as after telkeporting (from another map)
    /// 
    /// In this case we want to remember that player went through the teleporter previously ! !
    /// </summary>
    public static void SetTeleportedStatus()
    {
        Gateway = OnMapAppearanceMethodEnum.Gateway;
    }

    /// <summary>
    /// Function to check if its continued game but in special game
    /// 
    /// In this case we want to make sure ourselves that player previously went through the teleporter ! !
    /// </summary>
    public static bool IsAfterGateway()
    {
        return Gateway == OnMapAppearanceMethodEnum.Gateway;
    }


    /// <summary>
    /// Function to check that player just have been started new game
    /// </summary>
    /// <returns></returns>
    public static bool IsNewGameJustLaunched()
    {
        return IsNewGame() && Gateway == OnMapAppearanceMethodEnum.NewGame;
    }

    /// <summary>
    /// Function to check that player just started game
    /// </summary>
    /// <returns></returns>
    public static bool IsJustLaunched()
    {
        return (IsNewGame() || IsContinue()) && Gateway == OnMapAppearanceMethodEnum.LoadGame;
    }
}