The episode consists of three levels, which were either unused maps (leftovers from the game's development) or intended for deathmatch, however they are perfectly suited for solo play as well (they are fully stocked with monsters, weapons, ammo and artifacts).
Note: All level names are unofficial.
- In the original three-episode version of Heretic, there was one extra level, which appeared as E4M1. In the expanded version, this level is, in fact, E6M3: American's Legacy.
- The last level of this mini-episode does not have any exits, which means that players cannot proceed any further. Adding a level exit with a map editor and attempting to use it causes the game to crash.
|Heretic - Episodes & Levels|
| Episode 1|
City of the Damned
| The Docks • The Dungeons • The Gatehouse • The Guard Tower • The Citadel • The Cathedral •|
The Crypts • Hell's Maw • The Graveyard
| Episode 2|
| The Crater • The Lava Pits • The River of Fire • The Ice Grotto • The Catacombs • The Labyrinth •|
The Great Hall • The Portals of Chaos • The Glacier
| Episode 3|
The Dome of D'Sparil
| The Storehouse • The Cesspool • The Confluence • The Azure Fortress • The Ophidian Lair •|
The Halls of Fear • The Chasm • D'Sparil's Keep • The Aquifer
| Episode 4|
| Catafalque • Blockhouse • Ambulatory • Sepulcher • Great Stair • Halls of the Apostate •|
Ramparts of Perdition • Shattered Bridge • Mausoleum
| Episode 5|
The Stagnant Demesne
| Ochre Cliffs • Rapids • Quay • Courtyard • Hydratyr • Colonnade • Foetid Manse •|
Field of Judgement • Skein of D'Sparil
| Extra Episode|
|Raven's Lair • The Water Shrine • American's Legacy|