Levels

Doom/Ultimate Doom

 * Knee-Deep_in_the_Dead
 * The_Shores_of_Hell
 * Inferno
 * Thy_Flesh_Consumed (Ultimate Doom only)

Doom 2

 * Doom_II

The Plutonia Experiment

 * The_Plutonia_Experiment

TNT: Evilution

 * TNT:_Evilution

Heretic

 * Heretic:_Shadow_of_the_Serpent_Riders

Hexen

 * Hexen

Strife

 * Strife