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Floor 2 had larger volcanic cave corridors that stretched to three directions, the other two were dead ends that led to nests of Monsters. This time, aside from the Blazing Volcanic Rexes, we found large nests of Magma Salamanders, who fancied swimming and living on small pools of magma they built themselves.
From what I had learned about this Labyrinth Dungeon, each Floor changed its layout a bit, but were almost the same formula. And that was that there were always a corridor leading directly to the end of the Floor, which always ended on a gigantic pool of magma with the boss resting in there.
Of course, to maximize gains, parties would usually split into the two first corridors, hunt monsters there, and then go for the Boss once they rest enough, but for us, that was inefficient.