From the Super Mario Wiki
Spiral Mountain is a downloadable stage that appears in Super Smash Bros. Ultimate, released with Banjo & Kazooie as part of Challenger Pack 3 on September 4, 2019. Originally debuting in Banjo-Kazooie, it serves as the home to Banjo and Kazooie in the series.
Characters from the Banjo-Kazooie franchise appear, including Bottles the mole, Gruntilda the witch and her broomstick, Mumbo Jumbo, Tooty, variously colored Jinjos, and Buzzbombs. Aside from being background props, these characters do not affect gameplay at all. Gruntilda's Lair and Banjo's House are also visible. The camera pans around the hill over time, with the characters shifting their position accordingly. Platforms may appear and then exit the stage as well.
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