This is a little something I did. Link to the playlist here:http://www.youtube.com/playlist?list=PLEs9IkPoETK6R-Ft3wN8bu5-7VLfSbIAt
The rules are as follows:
-Must play the game on the Steam DOSBox (no source port allowed).
-Must always play on Ultra-Violence difficulty (skill 4 out of 5). Why not Nightmare? Because the game itself advertises it as unfair, and the Id team put it in there as a joke. They didn't think it was actually playable. Turns out it is, but I think I'll pass. Not to mention, since every enemy you kill respaws at random intervals in this mode, getting 100% Kills is absolutely meaningless.
-Must begin every level from a "Pistol start" (= "Spawn" conditions, with 100% Health, 0% Armor, and the Fist, Pistol and 50 bullets as my only weapons). There are two reasons for this rule: first, this is the way the developpers at Id originally playtested the game. Second, it forces me to complete each map using whatever resources it offers and nothing else. The most striking example of the difference this can make is the boss levels, none of which give you the ultimate weapon from their respective episodes with the exception of E4M8.
-Following the compet-n rules, I must get 100% Kills and 100% Secrets in every level (where possible without cheating, otherwise get the maximum amount that can be reached). I try to go for items too, but if I only fail that I'm not redoing it.
-No cheats are allowed, be it the official cheat codes other kinds of cheats. The only exception to this is IDCLEV, which is used to warp to a specific level.
-No saves allowed, ever. This rule prevents the use of save scumming, which is to say beating a level in micro-sections.
-No Gamma correction.
Must complete all 36 of the existing levels in "The Ultimate Doom" while following to the aforementioned ruleset, in the same order as the one in which they would appear when playing normally. This implies three things:
-Cannot skip a level and come back to it later.
-The secret level of a given Episode always follows the level that holds the secret exit; does not follow the boss level.
-Any level that does include a secret exit must be finished by using said secret exit, not the regular one.
-E2M4 to E2M9 (meaning three maps) have slight framerate problems, because I was trying to get my recording software to make the game behave the exact same as it does when not recording. None of them worked, so I gave up after that.
-E2M6, other than marking the end of the framerate issues, also marks the moment from which sound emulation switches from the somewhat limited SoundBlaster option to the much more impressive Gravis Ultrasound.
-From E3M7 onwards, all recordings are official .lmp Doom demo files, meaning I can actually play at the proper Doom framerate and record my already completed playthrough afterwards.
-As a special rule exclusive to E4M2 ("Perfect Hatred"), actual use of the BFG9000 is banned. The reason for this is that many players exploit a weakness in design regarding the placement of the BFG, which I consider a break in consistency as far as progression is concerned.
-Excluding maybe the first few levels, none of these demos particularly qualify as speedruns.
With all that said, enjoy the show!