The Cage-Lift Room is a location in Luigi's Mansion 3. It is on the first and second levels of the sixth floor, Castle MacFrights. It is east of the Antechamber and the Dungeon, and it is west of the Waterwheel Room. The yellow gem can be found here.
The part of this room that is on the second floor is a walkway leading to a wall with a banner that Luigi can pull on with the Poltergust G-00 to reveal a safe. Luigi then can flash the safe with the Strobulb to reveal a pearl. There is also a cage full of Gold Bars that Gooigi can walk through. On the north side is a fan that Luigi can blow on to move the elevator, which appears on the left side of the walkway. Blowing the fan one way makes the elevator go up and blowing the fan the other way makes it go down. Luigi can leave Gooigi to continue blowing on the fan while he goes into the elevator, this way he can access the part of the room that is on the first floor.
In the part of the room that is on the first floor, there is a rope on the east side of the room that Luigi can pull. Doing so will cause a bucket of water to splash him. Above this rope is a shelf that has coins on it. In the northeast side of the room is another fan that Luigi can use to control the elevator. The door leading to the Dungeon is locked, so Luigi needs to find a key. In the southeast corner, Luigi can use the Dark-Light Device to reveal a coffin, this coffin is a doorway to the Waterway Room. Luigi can investigate the coffin to end up in the Waterway Room which is where the key is. Once getting it, Luigi can open up the door to the Dungeon.
On the northwest wall, next to the elevator, is another fan that Luigi can blow causing a cage with the yellow gem to come down. Gooigi can then walk through the cage to get the yellow gem.
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