我不知道你要做哪个游戏，但是，我在我的项目中使用了下面的保存系统，它工作得很好，你也可以使用它。

using System.IO;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
// Saving System
public class UserData{
 #region Save Data Var's 
 // file Path
 private static readonly string FILE_PATH = Application.dataPath + 
 "/SaveFiles";
 public  int carToLoad;
 public  int levelToLoad;
 public  int unlockLevels;
 #endregion

 #region Methods

 // Save
 public static void SaveData(string contents){ // for Car Selection 
     File.WriteAllText(FILE_PATH + "/UserData.txt",contents);
 }

 // Load
 public static UserData LoadData(){
    string _data = File.ReadAllText(FILE_PATH + "/UserData.txt");
    return JSONToUserData(_data);
 }

 // Init 
 public static void UserData_init(){
    CheckFilesPreviousData();
    CheckDirectory();
 }

 // Selection Level Data 
 public static void SaveData(UserData LevelData) { // for Level 
    UserData tempObj = LoadData();
    tempObj.levelToLoad = LevelData.levelToLoad;
    SaveData(UserDataToJSON(tempObj));
 }

 // UnLock Level Data
 public static void SaveUnLockedLevelData(int LevelValue){
    UserData tempObj = LoadData();
    tempObj.unlockLevels = LevelValue;
    File.WriteAllText(FILE_PATH + "/UnLockLevels.text", 
 UserDataToJSON(tempObj));
}

 // Load UnLock Level Data
 public static UserData LoadUnLockLevelData(){
    string _data= File.ReadAllText(FILE_PATH+"/UnLockLevels.text");
    UserData tempObj = JSONToUserData(_data);
    return tempObj;
 }
 #endregion

#region Helper Methods
// !! important
 public static UserData JSONToUserData(string path) => 
  JsonUtility.FromJson<UserData>(path);// JSON to Obj
public static string  UserDataToJSON(UserData obj) => JsonUtility.ToJson(obj);// 
 Obj to JSON 

// Making Directory if not present
private static void CheckDirectory(){
    if (!Directory.Exists(FILE_PATH)){
        Directory.CreateDirectory(FILE_PATH);
    }
}

// Reset Data If User Play 1st Time
private static void CheckFilesPreviousData(){
    // Checking File is not Null
    UserData tempObj = LoadUnLockLevelData();
    if(tempObj == null){
        const int FIRSTLEVEL = 1;
        SaveUnLockedLevelData(FIRSTLEVEL);
        Debug.Log("Donee");
    }
    
}

#endregion

}