I found a few map modifications from the BBS days, before the Internet was widely used.
Just run GO.BAT on a computer with Windows 98, or it might work on DOS 6.2 or later (needs the CHOICE command to exist).
There's mods for Wolf3D and for SOD.
In some cases there were bugs which I fixed. Sometimes I also added a few extra sneaky pushwalls. Good luck finding them!
Some (perhaps most) games look like the originals at first glance but have subtle differences.
Let me know if you've got questions. A few savegames got saved... sorry about that.
::: CODE :::