void ClearDrawPath()
 {
     while (drawPathStack.Count > 0)
     {
         Node          popped = drawPathStack.Pop();
         ClickableTile tile   = map.tiles[popped.pos.x, popped.pos.y];
         if (!tile.IsAvailable())
         {
             tile.Highlight(false);
         }
         tile.SetValueText(tile.GetValue());
     }
 }