How do I find the boss on floor 40?

[Raving Rabbid Soldier]

I made it to floor 40 and the amount of enemies there make my laptop lag a bit. I noticed that the layout was different than other floors. Not only did it give off a final destination feel, but I assumed the rooms were leading me. There were two paths when I entered the first room, a locked door and an unlocked door. I saw a pattern and assumed there were two paths leading to the same destination. An easy path and a hard path based on the level of the monsters.
Now I am at the same point from which I started. So either that was just my imagination or my own fault. I cut through a lock door and then went to the easy path.

Does floor 40 have a specific pattern or is it completley random like all the other floors?

[Applesmacked]

It's basically your goal to get to the middle-ish of the floor, I say middleish because If I remember right it wasn't exactly middle but close.

The doors that are locked are shortcuts to the center if you break them or have keys for them they allow you to bypass resource draining rooms.

If you went back towards the begining you went the wrong way. Also there are some rooms that have 2 shortcut enterances requiring 2 different keys and one correct path, so if you take the shortcut way twice it is possible to waste time and find yourself at the beginning.