public static void UnlockLevel (int level)
    {
        if (level <= Application.levelCount - 1)
        {
            PlayerPrefs.SetInt(LEVEL_KEY + level.ToString(), 1);//Use 1 for true
        }
        else
        {
            Debug.LogError("Trying to unlock level not in build order");
        }
    }

    public static bool IsLevelUnlocked (int level)
    {
        int levelValue = PlayerPrefs.GetInt(LEVEL_KEY + level.ToString());
        bool isLevelUnlocked = (levelValue == 1);

        if (level <= Application.levelCount - 1)
        {
            return isLevelUnlocked;
        }
        else
        {
            Debug.LogError("Trying to query level not in build order");
            return false;
        }
    }