E3M7: Big Time (Serenity)

E3M7: Big Time is the seventh level of Serenity. It was designed by Bjorn Hermans and Holger Nathrath, and includes a custom music track.

Walkthrough

 * Letters in italics refer to marked spots on the map. Sector numbers in boldface are secrets which count toward the end-of-level tally.

Secrets
After accessing the teleporter west of the start of the level, head through the northern stairs, and open the wall at the top of the stairs. You will find a long tunnel which leads to the room accessed beyond the yellow door. You may also access the tunnel from that same room, by pressing on the section of the wall in the middle of the southwest of the room. There are four secret sectors in this tunnel; the first is the elevator you land on when you access it from the northwest, which can be called down by pushing the horned faces on its east side. (sector 123) The space in front of secret #20 is the second secret. (sector 127) The third secret in the tunnel is the long stretch of space in the southeast of the tunnel. (sector 149) The last secret sector in that tunnel is the space directly in front of the door to the room normally reached with the yellow key. (sector 150) The entire area in which the yellow key is obtained is flagged as secret. This includes the elevator that leads to it, the space just after it, the door that leads into it, and the passage that leads to it, which is split into five sectors. (sectors 89, 46, 92, 90, 144, 143, 156, 145) - 8 secrets total 
 * 1) The tunnel in which the blue key is found counts as a secret. (sector 95)
 * 2) The teleporter in secret #1 is also flagged as a secret, and is thus unobtainable without the noclip cheat. (sector 97)
 * 3) The entire area in the extreme south in which the switch that releases the monsters in the computer room is found is flagged as secret.  This includes each step of both stairways (16 steps in all), and the small space directly in front of the switch. (sectors 23, 24 through 38, and 177) - 17 secrets total

Bugs
In version 1.0, the lift to the yellow key (sector 107) can only be operated once; theoretically, the player might be prevented from reaching the exit if he does not pick up the key in time. Although the key and the nearby ammo are very close to the lift, it was the authors' intention to avoid creating any inescapable situations in these maps, and so the readme file refers to this as a "minor mistake."

Because secret #2 is unreachable without the noclip cheat, you can only get 96% Secrets in this level.

Current records
The records for the map on the Doomed Speed Demos Archive are:

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

Inspiration and development
An early version of this map appeared as E2M4 of the collection "Nathrath's Fab Four" (NATHRATH.WAD).