Some more insights:
I assume that Adventurers can’t walk diagonally. In that case we can try to look at dungeons where the same encounter is present in room 2 and 4 (or in room 6 and 8), so the adventurers must pass through that exact challeng. I then make a linear model on this encounter + include room 1 and 9 in order to control for the fact that dungeons with strong encounters in one room is more likely to also have them in others.
Looking at both the case where Enc2==Enc4 and the case where Enc6==Enc8 I got an agreement between the difficulties of the encounters (Nothing < W < G < B < O < S < H=D ). Clay Golems however differed.
It also seemed that in general meeting a tough challenge later would make a bigger difference than meeting it early.
So my plan will look the same as Abstractapplics for pretty much the same reasons, except I will place the Boulder Trap after the Whirling Blade, since Boulder Traps seems to be more challenging, and so should be encountered later.
So my plan is:
CWB / OOH/ XXD