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The Ivy Bathroom is a location in Luigi's Mansion 3. It is on the third level of the seventh floor of The Last Resort, Garden Suites. It is north of the Ivy Suite, and east of the Atrium. The white gem can be found here.
The Ivy Bathroom is a bathroom with a bunch of overgrown plants and vines. Scattered around the room are a bunch of watermelons. Luigi can destroy most of them alone using the Suction Shot, but to destroy the biggest watermelon, he will need the help of Gooigi. Once he destroys the huge watermelon, four Goobs will appear, once he defeats them he will be able to continue.
Luigi can fill up the bathtub by blowing on the faucet handles using the Poltergust G-00, and doing so will allow him to grab three extra watermelons which are filled with various items like coins and Gold Bars. If Luigi shines the Dark-Light Device in front of the toilet, he will reveal a grate that Gooigi can go through. Below are some golden Spiders and a couple of Strobe Flowers. If Gooigi shines the Dark-Light Device over where the water is flowing out of the pipe, he will reveal an invisible pipe that will stop the water from flowing out, this causes the water to be redirected toward a flower in the corner. If Gooigi flashes this flower with the Strobulb, the white gem will pop out.