So there was Doom. And there were roguelikes. Then there was Doom: the Roguelike. And now, the iconic special levels unique to DoomRL have their own adaptations in ye olde Doom 2 (or Final Doom). Each map also has co-op and deathmatch starts, and deathmatch-only items. See below for a summary of each map, and what's been tweaked in the process of adapting them. If a level's gimmick has you stumped, check there.
Credits:
Kornel Kisielewicz for making that wonderful roguelike, the maintainers of the always-useful DoomRL and ZDoom wikis, and of course id Software.
Base:
New from scratch
Build time:
About 2 weeks of on-and-off work.
Editor(s) used:
Doom Builder 2, Slade 3.
Bugs:
On the off chance that your chosen source port automatically fixes missing texture errors, some clever misuses of missing textures will break.