Thanks! I'm pretty sure we can get Part 1 even lower... the RNG is probably squirrel murderingly nuts though. Trapdoors do save a lot of time on the second half of a part 1 run, but trying to get them to spawn and finding them is harder than it looks.

I tried out detect traps in a few runs and ended up wasting way more time looking for them. My guess is if 5 drop Trapdoors are a thing in Part 1, that would be key to getting sub 5.