PlayerPrefs可以將字串、浮點數和整數儲存到使用者的登錄檔中，但未加密並不推薦儲存重要的數據。

建立兩個按鈕分別在Inspector的OnClick裡放入存檔和讀檔功能來觸發

PlayerPrefs

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

public class SaveLoad : MonoBehaviour
{
    [SerializeField]
    PlayerData Data;

    [System.Serializable]
    public class PlayerData
    {
        public string name;
        public float HP;
        public int Lvl;
    }

    public void Save()
    {
        playcontrol player = GetComponent<playcontrol>();
        int HP = player.hp;
        PlayerPrefs.SetString("name", Data.name);
        PlayerPrefs.SetFloat("HP", HP);
        PlayerPrefs.SetInt("Lvl", Data.Lvl);
        PlayerPrefs.Save();
    }
    public void Load()
    {
        Data.name = PlayerPrefs.GetString("name");
        Data.HP = PlayerPrefs.GetFloat("HP");
        Data.Lvl = PlayerPrefs.GetInt("Lvl");
    }
}

JSON

待更

參考資料:
https://docs.unity3d.com/ScriptReference/PlayerPrefs.html
https://www.youtube.com/watch?v=mKhetIXa7KA&t
https://dev.twsiyuan.com/2018/06/how-to-save-and-load-gamesaves-in-unity.html