Menu, Game mode Array String to change settings?

Here is the simple version (without any big code refactoring):

 using UnityEngine;
 using System.Collections;
 
 [ExecuteInEditMode]
 public class NewGame : MonoBehaviour
 {
     //Background Picture
     public Texture OptionsBG;
     //Back Button Varabels
     public GameObject MMCamra;
     public GameObject OPCarmra;
     public GameObject OPCarmra2;
     public GameObject OPCarmra3;
     //Save file name
     public string PlayerName = "Game Name";
     //Level of Difficulty selector Drop menu
     public string[] Difficulty;
     public string selectedDifficulty = "Difficulty";
     private bool editing = false;
     //System Size Drop menu
     public string[] SystemSize;
     public string selctedSystemSize = "System Size";
     private bool editing2 = false;
     //resources Drop menu
     public string[] Resources;
     public string selctedResources = "Resource Availability";
     private bool editing3 = false;
     //Game Mode Drop Menu
     public string[] GameMode;
     public string selctedGameMode = "Game Mode";
     private bool editing4 = false;
 
 
 
     private void OnGUI()
     {
 
         GUI.DrawTexture(new Rect(0, 0, Screen.width, Screen.height), OptionsBG);
 
         GUI.Box(new Rect(Screen.width * .01f, Screen.height * .01f, Screen.width * .98f, Screen.height * .85f), "New Game");
 
         PlayerName = GUI.TextField(new Rect(Screen.width * .02f, Screen.height * .04f, Screen.width * .25f, 25), PlayerName, 27);
 
         GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.075f, Screen.width * .25f, 25), "Game Mode");
         if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .1f, Screen.width * .25f, 25), selctedGameMode))
         {
             editing = false; editing2 = false; editing3 = false; editing4 = true;
         }
         if (editing4)
         {
             for (int x = 0; x < GameMode.Length; x++)
             {
                 if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .1f) + (25 * x), Screen.width * .25f, 25), GameMode[x]))
                 {
                     selctedGameMode = GameMode[x];
                     if (selctedGameMode == "Hardcore") // Or replace with the actual GameMode[N] value
                     {
                         selectedDifficulty = "Vary Hard"; // Or replace with the actual Difficulty[N] etc. values
                         selctedSystemSize = "Normal";
                         selctedResources = "Few";
                     }
                     editing4 = false;
                 }
             }
         }
 
         GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.145f, Screen.width * .25f, 25), "Level of Difficulty");
         if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .17f, Screen.width * .25f, 25), selectedDifficulty))
         {
             if (selctedGameMode != "Hardcore") // Or replace with the actual GameMode[N] value (and the ones below)
             {
                 editing = true; editing2 = false; editing3 = false; editing4 = false;
             }
         }
         if (editing)
         {
             for (int x = 0; x < Difficulty.Length; x++)
             {
                 if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .17f) + (25 * x), Screen.width * .25f, 25), Difficulty[x]))
                 {
                     selectedDifficulty = Difficulty[x];
                     editing = false;
                 }
             }
 
         }
         GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.215f, Screen.width * .25f, 25), "System Size");
         if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .24f, Screen.width * .25f, 25), selctedSystemSize))
         {
             if (selctedGameMode != "Hardcore")
             {
                 editing = false; editing2 = true; editing3 = false; editing4 = false;
             }
         }
         if (editing2)
         {
             for (int x = 0; x < SystemSize.Length; x++)
             {
                 if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .24f) + (25 * x), Screen.width * .25f, 25), SystemSize[x]))
                 {
                     selctedSystemSize = SystemSize[x];
                     editing2 = false;
                 }
             }
 
         }
         GUI.Label(new Rect(Screen.width * 0.02f, Screen.height * 0.285f, Screen.width * .25f, 25), "Amount of Resources");
         if (GUI.Button(new Rect(Screen.width * .02f, Screen.height * .31f, Screen.width * .25f, 25), selctedResources))
         {
             if (selctedGameMode != "Hardcore")
             {
                 editing = false; editing2 = false; editing3 = true; editing4 = false;
             }
         }
         if (editing3)
         {
             for (int x = 0; x < Resources.Length; x++)
             {
                 if (GUI.Button(new Rect(Screen.width * .27f, (Screen.height * .31f) + (25 * x), Screen.width * .25f, 25), Resources[x]))
                 {
                     selctedResources = Resources[x];
                     editing3 = false;
                 }
             }
 
         }
 
 
 
         if (GUI.Button(new Rect(Screen.width * .15f, Screen.height * .9f, Screen.width * .1f, 25), "Reset"))
         {
             PlayerName = "Game Name";
             selectedDifficulty = "Difficulty Level"; editing = false;
             selctedSystemSize = "System Size"; editing2 = false;
             selctedResources = "Resource Availability"; editing3 = false;
             selctedGameMode = "Game Mode"; editing4 = false;
         }
 
 
         if (GUI.Button(new Rect(Screen.width * .01f, Screen.height * .9f, Screen.width * .1f, 25), "Back"))
         {
             Debug.Log("Switching to Main Menu");
             MMCamra.gameObject.SetActive(true);
             OPCarmra.gameObject.SetActive(false);
             OPCarmra2.gameObject.SetActive(false);
             OPCarmra3.gameObject.SetActive(false);
         }
     }
 }