Local Save in Unity (SERIALIZATION) – Save Game, Variables, Levels

Saving and loading your game in Unity is not hard at all if you know the right way to do it. When you use binary serialization in C# you have already won half of the battle.

GameData.cs

using UnityEngine;
using UnityEngine.UI;

public class GameData : MonoBehaviour {

	public int GameInteger { get; set; }
    public string GameString { get; set; }

    [SerializeField]
    private Text textInteger;
    [SerializeField]
    private Text textString;

    public void GenerateNewData()
    {
        GameInteger = Random.Range(1, 1000);
        GameString = System.Convert.ToBase64String(System.BitConverter.GetBytes(GameInteger));
        ShowData();
    }

    public void ShowData()
    {
        textInteger.text = GameInteger.ToString();
        textString.text = GameString;
    }
}

SaveScript.cs

using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using UnityEngine;

[RequireComponent(typeof(GameData))]
public class SaveScript : MonoBehaviour {

    private GameData gameData;
    private string savePath;

	void Start () 
	{
        gameData = GetComponent<GameData>();
        savePath = Application.persistentDataPath + "/gamesave.save";
	}
	
	public void SaveData()
    {
        var save = new Save()
        {
            SavedInteger = gameData.GameInteger,
            SavedString = gameData.GameString
        };

        var binaryFormatter = new BinaryFormatter();
        using (var fileStream = File.Create(savePath))
        {
            binaryFormatter.Serialize(fileStream, save);
        }

        Debug.Log("Data Saved");
    }

    public void LoadData()
    {
        if (File.Exists(savePath))
        {
            Save save;

            var binaryFormatter = new BinaryFormatter();
            using (var fileStream = File.Open(savePath, FileMode.Open))
            {
                save = (Save)binaryFormatter.Deserialize(fileStream);
            }

            gameData.GameInteger = save.SavedInteger;
            gameData.GameString = save.SavedString;
            gameData.ShowData();

            Debug.Log("Data Loaded");
        }
        else
        {
            Debug.LogWarning("Save file doesn't exist.");
        }
    }
}

Save.cs

using UnityEngine;

[System.Serializable]
public class Save {
    public int SavedInteger;
    public string SavedString;
}