E3M9: Warrens (Doom)

E3M9: Warrens is the secret map of Inferno in Doom and can be accessed from E3M6: Mt. Erebus. It is based on E3M1: Hell Keep, and is similar until the natural end of E3M1, at which point the player must retrace his steps. It uses the music track "Hiding the Secrets". The par time is 2:15.

Overview
On entering the level, the player should become aware that the scenery is familiar. The map is identical to E3M1 until the player reaches the area which formed the exit of this map.

The player is suddenly confronted by a cyberdemon in place of the level exit. From this point onwards, sections of the map will have opened up to reveal new areas and more enemies. The player must retrace their steps to the beginning in order to find the true exit.

Walkthrough
Activate the lift and open the door. Take the shotgun on the bridge to the left; you must be quick, because the bridge will descend into the surrounding pool of blood. Open the door and go into the corridor. Go outside and enter the teleporter. Suddenly, the walls will descend and the cyberdemon will make a dramatic entrance. Hurry to collect the rocket launcher, the rockets for it and the invulnerability sphere. While invulnerable, battle the cyberdemon and after disposing of him, retrace back to the level's beginning. Go into the new corridor and you will be teleported into a new area. Collect the red key, return to the starting area and use it to open the newly revealed door to the exit teleporter.

Official

 * 1) In the same place as in E3M1: Open the wall on the left in the room before the fake exit (sector 23).

Non-official

 * 1) Once you have gone through the fake exit, go back to where the sinking bridge used to be, jump into the blood and keep to the right. In the tunnel, a new compartment has been revealed, containing a [radiation suit]] and a BFG9000.

Bugs
Two "hanging leg" decorations (things 80 and 82) have no flags set for any of the difficulty classes, so they do not actually appear in the level.

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. This bug is also present on E3M1, but is much easier to perform on this level than on E3M1 because the ceiling of the sectors either side of the door on E3M9 are higher than they are on E3M1.

It is also possible to get stuck in the room with the red pillars by opening the blue door once you have the blue skull, closing it from the other side, opening it again and going back in the room, and letting it close on its own. At that point the blue door will now no longer respond and remain closed forever preventing you from finishing the level.

Current records
The Compet-N records for the map are:

The data was last verified in its entirety on November 20, 2012.