Well here's a secret exit run of map4. If you're going the secret route I'd suggest picking up the shells at the beginning, you need the extra ammo for all the shit that gets in your way towards the end. The way these can be improved is if you can manage to get on the ssg ledge and go from there, but it's a pain in the ass to do. I guess you could skip the ssg bump but you'd basically have a squirt gun to work with.
It's a pain in the ass to get a low time on map09 aswell, you have to be very precise handling the switches, as you can see in my first playthrough i fucked that up alot. It can be improved with precise switch handling, and if you got the skill you can sr50 over the gate and not even bother with hitting the switch but this can be pretty hard to do.
So the only way to get the secret exit to work for vanilla doom is to just move the maps? what about a mapinfo lump? I don't have much editing experience so excuse my ignorance. nr04s-121.zip