Elevator Hall (Fitness Center)
From the Super Mario Wiki, the Mario encyclopedia
The elevator arrow is shaped like a dumbbell. There is a bronze Hammer fountain on each side of the elevator. Luigi can vacuum them to make coins come out of their mouths. To the left is a telephone on a table. If Luigi picks it up, he hears a jingle followed by spooky laughter. The phone may also occasionally ring; if Luigi picks up the phone while it is ringing, he will instead receive a hint on how to obtain the purple gem in the Training Room. To the right are shelves holding trophies behind glass. There is an invisible bag of Bills in the southwest corner Luigi can use the Dark-Light Device to reveal.
To get the yellow gem, both Luigi and Gooigi must stand on the symbol in the middle of the floor, which is actually a pressure plate raising the glass protecting the trophies, allowing them to get the gem.
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