It's Grunty's Castle. Get ready for a showdown.
This is the closest thing I could find
Description[]
Your match takes place on top of one of the turrets. It's where Banjo and Kazooie had their final battle with Gruntilda in Banjo-Kazooie. There are no suspended platforms, just like Final Destination. Gruntilda can be seen flying her broomstick in the background.
Occasionally, a jinjo appears and calls for help(even though it's perfectly capable of helping itself, the lazy (bleep)). If you "rescue"(touch) the jinjo, it'll fly away leaving an item as a thank you gift. The items do not include the following:Pokeballs, Assist Trophies, Dragoon Parts, Hydra Parts, Smash Balls.
Jinjo
Watch out though, occasionally a minjo appears instead of a jinjo(you can tell them apart by the fact that minjos have red eyes). If you "rescue" a minjo, it'll attack you.
Minjo