code: function loadTMXLevel(levelId, container, flatten, setViewportBounds) {
              var level = levels[levelId];
  
              // disable auto-sort for the given container
              var autoSort = container.autoSort;
              container.autoSort = false;
  
              var levelBounds = level.getBounds();
  
              if (setViewportBounds) {
                  // update the viewport bounds
                  me.game.viewport.setBounds(
                      0, 0,
                      Math.max(levelBounds.width, me.game.viewport.width),
                      Math.max(levelBounds.height, me.game.viewport.height)
                  );
              }
  
              // reset the GUID generator
              // and pass the level id as parameter
              me.utils.resetGUID(levelId, level.nextobjectid);
  
              // Tiled use 0,0 anchor coordinates
              container.anchorPoint.set(0, 0);
  
              // add all level elements to the target container
              level.addTo(container, flatten);
  
              // sort everything (recursively)
              container.sort(true);
              container.autoSort = autoSort;
  
              container.resize(levelBounds.width, levelBounds.height);
  
              function resize_container() {
                  // center the map if smaller than the current viewport
                  container.pos.set(
                      Math.max(0, ~~((me.game.viewport.width - levelBounds.width) / 2)),
                      Math.max(0, ~~((me.game.viewport.height - levelBounds.height) / 2)),
                      0
                  );
              }
  
              if (setViewportBounds) {
                  resize_container();
  
                  // Replace the resize handler
                  if (onresize_handler) {
                      me.event.unsubscribe(onresize_handler);
                  }
                  onresize_handler = me.event.subscribe(me.event.VIEWPORT_ONRESIZE, resize_container);
              }
          }
docs: Load a TMX level
  @name loadTMXLevel
  @memberOf me.game
  @private
  @param {String} level level id
  @param {me.Container} target container
  @param {boolean} flatten if true, flatten all objects into the given container
  @param {boolean} setViewportBounds if true, set the viewport bounds to the map size
  @ignore
  @function