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: Beyond Heretic

 * Hub_1:_Seven_Portals
 * Hub_2:_Shadow_Wood
 * Hub_3:_Heresiarch's_Seminary
 * Hub_4:_Castle_of_Grief
 * Hub_5:_Necropolis

Hexen: Deathkings of the Dark Citadel

 * Hexen: Deathkings of the Dark Citadel

Strife

 * Strife