Maps in order of levels.

[FatalLace]

I would add Lumi Stone 1 between Sea of Greed & BH, though it's hard to say if it's a lower or higher map than BH.. i would think it's the same difficulty (without taking Marlone into consideration), if not even a bit harder. i put it as a bit easier since you're still fighting grave robbers and keebings in some of the early rooms.

Lumi Stone 2 after Burning Hill ... though again, there are staffs and books in there that are harder than half the MT map (bone imps, ice vivis, spiders, bats).. ahwell *shrug*