DOOM 1 - CWave.wad
Channel: DOOM WAD World
Date: 2022-11-20

called "Continuous Wave" in the /idgames FTP.
https://www.doomworld.com/idgames/levels/doom/a-c/cwave
created by Raphael Cheney on January 11th, 2001.
from the .txt file included with the WAD:
"Terrestrial venture capital was raised to establish a secret UAC base deep in enemy territory, because the foe was so adept at formulating cybernetic viruses to botch up human-engineered computers and robotic CPUs, and you, knowing that Morse Code had made something of a low-key comeback (no pun intended) for its relative simplicity and corresponding immunity to such sophisticated viruses, and thinking it would be a ticket to high adventure and fast upward mobility through the ranks of corporate clones in their plodding multitudes, applied for and received a Terran liason assignment at the Cypher Communications Facility, where you have only just arrived from a galaxy-spanning trip.
 Before you have time to take over your proper duties from your former replacement counterpart, an alert is sounded and you discover that the base is being invaded by monsters, and while you look on in frozen shock, the human defenders fight fiercely back against numerically and logistically superior alien forces, causing you to finally retreat to your duty assignment, where you discover to your horror that the source of the enemy breakthrough is the last place anyone would ever have thought to look, the formerly impregnable Morse Code Training Unit, where you discover that the enemy has been invading through a malfunctioning teleporter.
 Coal-black smoke pours out of the building where the malfunctioning teleporter is located, but you quickly find the main circuit board and disconnect the power to the teleporter in question to try to bring the stubborn electrical fire under control, and while savage gunfire from desperate last-ditch firefights echoes across the rest of the base, you work single-handedly to get the ventilation system switched over to external ducting so you can air out all the smoke.
 Relays continue to spark and smoulder as you search frantically for a weapon, but you find nothing.  
 Then the door behind you opens, and you almost turn to run in futility before realizing it is a wild-eyed and dishevelled-looking human operative, so you immediately ask what the layout of the complex is like, or where can you find something to defend yourself with.  
 Handing you a pistol, the operative gasps in a hoarse voice, "The entire Morse Code Unit is infested with mosters; you'll just have to do your best and clear them out yourself!" 
 Watching in horror, you stare numbly as he collapses to the deck, obviously a goner.
 Map headings flash through your mind as you sort out too much recently-acquired data from your synapses, seeking to remember the precise layout of the Morse Code facility.  
 However this invasion is going to be stopped, you can pretty much guess by now that it's either going to be stopped by you or by no one, because the gruesome sounds outside the building aren't very encouraging.  
 Then you dimly recall that the facility consists of a long series of chambers or open-sky rooms, each with an alpha-numeric character set in the floor just inside the entrance, and to either side of it, a correct and an incorrect Morse Code signal (consisting of a string of dots and dashes) also set in the floor, leading to two exit doors, one correct and one incorrect.  
 As seen from a map you only glanced at earlier but wish now you had rote-memorized, you recall that wrong answers lead through doors that result in dead-ends, and correct answers lead through doors opening out into successive chambers, starting with the alphabet, followed by all ten single-digit numbers, and ending with a few special characters, normally a fun and engaging exercise, except that now, behind every door may lurk monsters. 
 Are you the only UAC operative left alive, you wonder, and if so, can you get through the maze, and save the base?"

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