Ki and Gil will enter this room through the door at the top-right of it. It contains two Blue Oozes (which take 462 hits to kill), eight "Pink" Ropers (which are white and take 568 hits to kill), and three "Green" Super Ropers (which are orange and take 780 hits to kill; they will also move at a faster speed).
The key at the top-right of the room opens that aforementioned door at the top-right of the room, and the key at the bottom-left of the room opens the door at the bottom-left of the room. (You will have to make sure that you do not step on either of the two Oozes while trying to collect them, however).
That aforementioned door at the top-right of the room leads back to Remains (Room Pass: DV7 - same as Large Hall), while that door at the bottom-right of the room leads off to Condemned Ward (Room Pass: HC2 - same as Colosseum). You should remember the second of these Room Passes.
