Etrian Odyssey/Azure Rainforest

If after beating the forest king on the previous floor you have not returned to town yet you won't be able to explore much of this area. It is still a good idea to explore a little bit before going back if you have enough HP and empty space for items.

Geomagnet Field
The first door you find after entering the level will lead to a Geomagnetic Field. An event will stop any further progress farther down the hallway for now. Backtrack to the Geomagnet Field to freely return to town without spending a Warp Wire.

Once back at town go to Rahda Hall and report the results of your now finished mission, The hunt for Cernunos. Afterwards the new mission Map the newfound Stratum will become available. Accept it and use what resources in town you need before returning to the labyrinth. With that newly found Geomagnet Field it will be easy to go quickly back and forth in-between B11 and town. If your party is not quite strong enough to endure many battles in this area it is a good idea to train a bit near the Geomagnet Field.

Further exploration of the wood
There are town guards lost in these woods attempting to also make a map like you are. If you find one of these terrified guards they will give you what areas they have mapped and flee the labyrinth. These small segments tend to be areas where wandering monsters can be found so be weary while filling in the missing spots of these maps.

B12: The Insect Queen's palace
There are many pits in B11 that will lead to this floor. If you find yourself suddenly trapped here the stairs back up are in the lower section of D5 on the map grid.