MAP20: Unholy Cathedral (Console Doom)

MAP20: Unholy Cathedral is the twentieth level of most console versions of Doom, based on the original E3M5: Unholy Cathedral with modifications made to adapt to the consoles' memory and ROM size limitations. It was converted by American McGee and originally designed by Sandy Petersen. The map first appeared in the Atari Jaguar version, and is additionally used in the 3DO, Game Boy Advance, Sony PlayStation, and Sega Saturn versions.

Essentials
Main route

Alternative route

Exit

Secrets

 * 1) (sector 54)
 * 2) (sector 74)
 * 3) (sector 75)
 * 4) (sector 121)
 * 5) (sector 123)
 * 6) (sector 152)
 * 7) (sector 164)
 * 8) (sector 220)

Bugs
Six "hanging leg" decorations (Things 216 through 221) have no flags set for any of the difficulty classes, so they do not actually appear in the level. Things 220 and 221 are placed on top of one another as well.

Comparison of versions
Numerous changes exist in the level as compared to its PC version:

Geometry simplification

 * The walls surrounding the teleport landing pad in the middle of the central outdoor area were removed.
 * The pillars in the hallway west of the central area are square rather than octagonal.

New design
Some rooms in the level were redesigned:
 * The crushers protecting the switches in the blue key chamber were removed.
 * Walking into the large room past the exit door will cause two chambers to open and release a number of monsters. On the PC version of the level, the monsters teleport in instead.

Other

 * Lorem ipsum

PlayStation
Some additional changes were made in the PlayStation port:
 * Lorem ipsum

Music
The map uses the following music tracks:

Player spawns
This level contains five spawn points:
 * 1) facing north. (thing 278)
 * 2) facing south. (thing 279)
 * 3) facing south. (thing 280)
 * 4) facing north. (thing 281)
 * 5) facing north. (thing 282)

Things
This level contains the following numbers of things per skill level: