Hollow Bastion

Hollow Bastion is an upcoming downloadable stage in Super Smash Bros. Ultimate, set to release on October 18, 2021 along with Sora. It is set on a platform in front of the Hollow Bastion castle from the  franchise. The stage was announced on the same day as Sora, on October 5, 2021.

Different characters, locations and miscellaneous references to the Kingdom Hearts series will appear in the background of the stage. If either time is running low in the battle, or a player has a low stock count, the stage will transition into a different, darker environment with the background featuring murals of characters from the series. This second part of the stage is based on the "Dive to the Heart" realm from the series.