void Start()
{
// level
PlayerPrefs.SetInt(this.name + " level", PlayerPrefs.GetInt(this.name + " level", 1));
// experience
PlayerPrefs.SetInt(this.name + " experience", PlayerPrefs.GetInt(this.name + " experience", 0));
LevelUpManager levelUpManager = GameObject.Find("LevelUpManager").GetComponent <LevelUpManager>();
playerXPNextLevel = levelUpManager.GetXPNextLevel(PlayerPrefs.GetInt(this.name + " level"));
PlayerPrefs.SetInt(this.name + " experienceNext", playerXPNextLevel);
// show level of player
playerLevelText = transform.Find("Canvas/Level").GetComponent <Text>();
playerLevelText.text = "Lvl " + PlayerPrefs.GetInt(this.name + " level");
// show experience points of player
playerXPText = transform.Find("Canvas/Experience").GetComponent <Text>();
playerXPText.text = "XP " + PlayerPrefs.GetInt(this.name + " experience") + "/" + playerXPNextLevel;
}