Code from https://unity3d.com/learn/tutorials/topics/scripting/persistence-saving-and-loading-data

Player.cs

/**
 * Transcribed from Persistence - Saving and Loading Data Tutorial video.
 * Original code by Mike Geig.
 * Transcribed by rocky1138.
 * No idea on what the license is. I think it's fairly safe to assume public domain
 * since it's part of a tutorial video.
 * https://unity3d.com/learn/tutorials/topics/scripting/persistence-saving-and-loading-data
 */
using UnityEngine;
using System.Collections;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
using System;

public class Player : MonoBehaviour {

	public float health;
	public float experience;

	public void Save () {
		BinaryFormatter bf = new BinaryFormatter ();
		FileStream file = File.Open (Application.persistentDataPath + "/playerInfo.dat", FileMode.OpenOrCreate);

		PlayerData data = new PlayerData ();
		data.health = health;
		data.experience = experience;

		bf.Serialize (file, data);
		file.Close ();
	}

	public void Load () {

		if (File.Exists (Application.persistentDataPath + "/playerInfo.dat")) {
			BinaryFormatter bf = new BinaryFormatter ();
			FileStream file = File.Open (Application.persistentDataPath + "/playerInfo.dat", FileMode.OpenOrCreate);
			PlayerData data = (PlayerData) bf.Deserialize (file);
			file.Close ();

			health = data.health;
			experience = data.experience;
		}
	}


}

[Serializable]
class PlayerData {
	public float health;
	public float experience;
}