[9-30] E4M8: The Nameless City (Secret Level)

Follow the passage beneath the gold key platform. Take the right passage up a small ramp. To the right, press a wall button over a passage. This opens a wall revealing zombies. Past the zombies is a platform leading to a small room with a shambler. Jump into the hole in this room to land on a ledge with the red armor.

In the room from step #1, there's a large hole overlooking another hole with a small ledge. Jump to this ledge and look down. You'll see water below, but a small ledge halfway down contains health and a Quad Damage power-up. Jump to this ledge to collect them.

After secret #2, jump into the water. Press the button on the right side of the room to lower a walkway, acting as an elevator. Ride it up. Jump into the square cage in the center and activate the button inside. The cage will lower into a room filled with zombies. Shoot the switch on the wall to exit the cage. Follow the passageway out of this dark room and press the switch at the end to activate the elevator. Ride the platform to the top and jump through the window. Follow the short passageway to the gold key. Collect it, then go to the gold doors at the end of the long hall and collect the items within.

After entering the silver door, turn right and go up the ramp. Kill the zombies below the mesh. You can access this area by dropping through one of the triangle-shaped openings. Press the button to exit this area.