MAP41: O of Destruction! (PlayStation Doom)

MAP41: O of Destruction! is the forty-first level of the PlayStation and Sega Saturn versions of Doom, and the eleventh level of the Doom II episode. It is based on the original MAP11: 'O' of Destruction! (also known as Circle of Death), with modifications made to adapt the map to the consoles' limitations. The author of the original map is John Romero.

Secrets

 * 1) (sector 10)
 * 2) (sector 117)
 * 3) (sector 159)

Comparison of versions
Several changes were made to this level compared to the PC version.

Geometry simplification

 * Several staircases have fewer steps.

Room design

 * The number of columns in the corridor behind the red door is reduced from seven to five.
 * The walls either side of the exit switch are diagonal rather than straight.

Monster placement

 * The arch-vile guarding the blue keycard is replaced with an arachnotron.
 * The spectre behind the red door on Hurt Me Plenty and Ultra-Violence skill levels is replaced with a nightmare spectre.
 * The revenant at the top of the staircase past the red door is replaced with a cacodemon.
 * Hell knights are replaced with chaingunners.
 * Lost souls are replaced with shotgun guys.
 * Pain elementals are replaced with cacodemons.

Other

 * In v1.9 of Doom II, lowering the column with the rocket launcher next to the revenant also lowers a nearby platform, allowing you to leap straight to the ledge on the north side of the "O". This platform is missing from console versions of the level because they are based on v1.666.

Music
The map uses the following music tracks:

Player spawns
This level contains seven spawn points:
 * 1) facing north. (thing 122)
 * 2) facing south-east. (thing 123)
 * 3) facing east. (thing 124)
 * 4) facing east. (thing 125)
 * 5) facing west. (thing 126)
 * 6) facing south-west. (thing 127)
 * 7) facing west. (thing 128)

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