This level occupies the map slot MAP24. For other maps which occupy this slot, see Category:MAP24.
MAP24: The Haunting (called Residence Quarters on the TeamTNT website, and Residence Quarters -- The Haunting on the official secrets page) is the twenty-fourth level of Icarus: Alien Vanguard. The level is set within the residence quarters of the exploration cruiser, Icarus, as well as in entertainment facilities on the ship, including a nightclub and a movie theater. It was designed by Gary Gosson, and uses the music track "Ghost in the Machine" by David "Tolwyn" Shaw. It is one of a few Doom II levels which feature intentional ghost monsters, created by having an Arch-Vile resurrect a monster who has been crushed.
A portion of wall in the southeast of the nightclub is misaligned, and does not scroll. Open it to find four boxes of rockets. (sector 435)
Routes and tricks
As with many other levels in Icarus that have "teleporter" or "begin simulation" exits, a death slide can be performed on this level in the exit hall. It can be performed blasting yourself off the red computer panels using the rocket launcher, with your back facing the teleporter. Your corpse will slide under the barrier and into the teleporter, ending the level. As you are given a rocket launcher at the very beginning of the level, and there are no hellspawn blocking your path to the exit, a time under half a minute is very easy to obtain in this fashion, even on Nightmare difficulty.