/// <summary>
/// Convience getter, which returns the level group in which the given level is.
/// </summary>
/// <remarks>@since version 1.4.0</remarks>
public string GroupOfLevel(string levelId)
{
if (!configurationAdapter.LevelExists(levelId))
{
throw new ArgumentException("Level " + levelId + " does not exist.");
}
return(configurationAdapter.GetGroupOfLevel(levelId));
}