MAP21: Slayer (The Plutonia Experiment)

MAP21: Slayer is the twenty-first map of Plutonia. The music is the same as for Doom II's intermission text screens, and indeed there is a text screen just before this level starts, and since the text screens always end before the music finishes (usually in less than a minute), playing this level is the only way to hear the whole nearly five-minute music track. Like Doom II's MAP11: Circle of Death, the center of the level is a raised walkway ring, but otherwise the setup is not related.

Walkthrough
At the start of the level drop into the platform collecting a soul sphere, super shotgun and plasma rifle. Jump to the floor and ride the lift up to the central walkway. Run around the walkway towards the western side and enter the side room. Run down towards the northern end of it and activate a switch. Return to the central walkway and to the eastern side with a red door and go into the side room and activate the switch. Enter the teleporter and you will be in an area overlooking the central walkway. Walk through the newly raised walkway towards the red key and grabbing the megasphere along the way. As soon as you get the red key, the walkway will lower back towards the lava floor. Jump down to the lava and run towards the closest lift and return to the walkway. Return to the area with the red door and activate the switch behind it. Be careful as multiple enemies will be teleported including an Arch-Vile. Run towards the south end of the walkway and enter the room there and exit.

Secrets
There are no official secrets in this level.

Records
The Compet-N records for the map are: