The Return of Ishtar/Upward Passway


 * Ki and Gil will enter this room through the door at the top-right of it. It contains six "Red" Ropers (which are green and take 134 hits to kill), one "Blue" Roper (which is yellow and takes 254 hits to kill), and six Dark Green Slimes (which take 208 hits to kill). This also the new largest room in the game.
 * The key at the top-right of the room opens the door at bottom-left of the room - and the key at the bottom-left of the room opens the aforementioned door up at the top-right of the room. (The seven Ropers, combined with those six Dark Green Slimes, might make them difficult to collect, however).
 * The door at bottom-left of the room, like the one at top-right of Private Alter, leads to Quox's Labyrinth (Room Pass: 7C7) - and that aforementioned door at the top-right of the room leads back to Trap Ceiling (Room Pass: H3Y). You should remember the first of these Room Passes, for the future.