I don't know what it is exactly about this map that gives me the willies, but after a while, playing on it really begins to affect me in a deep and disturbing way. Playability The Marine is blessed with some good hardware including minigun, grenade launcher, pistols, skeeter, flame thrower, smartgun with some armour and health to help keep him propped up during fights. You will find two grenade launchers, a minigun and some health in the pit room. The predator is allowed a single field energy pick up which is probably a bit sparse. Aliens will be able to run a spiraling attack quite easily down most of the passages and avoid being shot at by running forward and strafing continually in one direction at the same time.
Aliens also have the benefit of hiding in one of the four ceiling recesses in the pit room.
These shallow hidey holes offer the only real safe place to camp. Too bad it's above a big pit. The map is completely horizontal in its layout and there are no vents or vertical passages for Aliens to take advantage of. Overall Fleshbox is quite possibly one of the most visually and aurally unsettling maps ever created for any game. It is a nightmarishly unpleasant environment and having to share it with the company of Predators and Xenomorphs is probably what some people's vision of what Hell might be like.