>>11889603
neato. the hint isn't particularly visible though. the final teleport doesn't seem necessary since there's a W1 Door before it. also I didn't realize monsters could trigger that? that opens up more possibilities for logic gates
there doesn't seem to be any coherent source of truth regarding line specials. look at this:
https://doom.fandom.com/wiki/Linedef_type
>4 Reg W1 No Slow 4s Yes Open, Wait, Then Close
the Yes there means monsters can trigger it. compare to
https://doomwiki.org/wiki/Linedef_type
>4 Doom W1 Door
doesn't say monsters can trigger it

>sector #20 is non-contiguous
this reminds me, has anyone done anything with non-closed sectors? sectors can have open sides, which might enable more shenanigans