Wad ideas.
I checked out the mapgen site, and this is what I got.
Build a cramped twisted computer lab map.
The player has to find some skull key,
destroy ridiculous numbers of lost UAC machine,
find a rocket launcher,
kill ridiculous numbers of Pain Elementals,
find a rocket launcher which is hidden behind a few demon gateway,
kill a lot Demons which guard a rocket launcher,
destroy ridiculous numbers of lost UAC machine and
find a BFG9k which is hidden behind a lot demon gateway