Z1M1: Hangar is the first level of Knee-Deep in ZDoom, revisiting the classic E1M1 with some new twists.
Go in through the door in front of you, on your left through the corridor is a smaller door. Hit the switch up the red staircase to open the jammed door in the previous room, inside are Zombiemen and imps, after dealing with these enter the door on the left. Look familiar? It should, because this is the starting room of E1M1: Hangar. Kill the zombiemen and imps and hit the switches in the two acloves to disable the green forcefields and go retrieve your armor. Go into the hallway where you will be ambushed by imps and then go forward and go into the door in front of you and kill the Rapid fire trooper and imps then go into the air-lock in front of you and kill the rapid fire troopers and go outside. Kill the hellspawn there go inside and kill the monsters, afterwards go into the door on your right, and hit the switch to lower the Shotgun and grab it to kill the lights and kill the Stone Imp and demons. Afterwards grab the red key off of the pedestal and go out the door that was on the opposite side of the hallway were you came in the area where the door where the shotgun and the rest of the level is kind of like level that this map is based off of.