E3M9: Warrens (Doom)

E3M9: Warrens is the secret map of Inferno in Doom and can be accessed from E3M6. It is based on E3M1, and is similar until the natural end of E3M1, at which point the player must retrace his steps.

Overview
It is possible to lock yourself out of the first room by pressing the button to lower the first door in the level and then quickly running through the door before it closes. This will prevent you from beating the level. (Tested on the Collectors Edition of Doom)

Records
The Compet-N records for the map are: