/// <summary>
 /// Sets this <c>Level</c> as completed.
 /// </summary>
 /// <param name="completed">If set to <c>true</c> completed.</param>
 public override void SetCompleted(bool completed)
 {
     if (completed)
     {
         State = LevelState.Completed;
         LevelStorage.IncTimesCompleted(this);
     }
     else
     {
         State = LevelState.Idle;
     }
     base.SetCompleted(completed);
 }