This item can be found in the glowing water area of Waterfall, seen just after an area where Sans with his telescope, Loren, and the Nice Cream Guy are located. If the bridge to the left of this area is traversed, a small area with a bush in the center can be found.
The Ballet Shoes are located in the bush. If befriended and called with the Cell Phone, Undyne mentions that "There's normally a pair of old shoes in that seagrass." She then encourages the protagonist to take them, as "Whoever wore them isn't coming back!"
When attacking with them, three bars appear instead of one. Hitting a bar exactly in the center causes it to flash gold while missing a bar causes it to flash red. The animation appears to be the bottom of a shoe, as though the protagonist kicks when using the item. Hitting at least two bars in the center with the other one close by causes the attack animation to appear golden, which increases damage.
- Because the Ballet Shoes are covered by tall grass, their overworld sprite goes unused.