After being tortured for near three hours straight, mapping out optimized routes and listing all the treasure in a .txt file whilst praying for RNG favour I did manage to get the Comically Large Diamond Anniversary.
Took me around 20 runs. I had two optimized routes together in black and white after about the 6th run but it was just the roulette wheel favouring the house that was killing me off.
By the end of the first hour I knew no matter how I decided to tackle it exactly where I was and where the treasure was. There was no wastage in overstepping but I was despairing that it would be impossible since after getting the final treasure my agility and HP would be so low that it would be near impossible to run away from ANYTHING before it would kill me.
I started resorting to tricks like two tile stepping at the stairs of the first level to trigger an encounter to reset the count before descending.
I would even dash a few steps, open and close the menu multiple times in the hope that it would somehow not trigger an encounter on the next steps. I don't think this applies to RM2K games but I am sure it was a thing in old 8 and 16 bit JRPGS, though curiously it did seem to work on my victory run since I got to the first floor with 4HP and managed to get back to the stairs without an encounter.
By the end I was a quivering husk who could scarce string a brace of words together. Conceptually, this game is fantastic and the execution is nearly perfect. There are many things I did muse over in how to improve or expand on this but I think sometimes you do have to leave things as they are in their raw state and just appreciate what is actually there for all it's merits (and sometimes it's warts.)
Awesome job and I can't wait to study your next game!