Banjo-Kazooie Gruntilda's Mask is a ROM hack likely centered around Gruntilda, the main antagonist from the original game. This is a community-made modification of Banjo-Kazooie, not an official release by Rare. The gameplay would probably involve facing Gruntilda in new ways or potentially introducing new challenges related to her character or abilities. It adds more to the existing narrative and gameplay of the original game.

Banjo-Kazooie Gruntilda's Mask

Banjo-Kazooie Fort Adventure