Banjo-Kazooie: Grunty's Revenge is a 2003 platform game by Rare for Nintendo's Game Boy Advance (GBA). It is the third installment in the Banjo-Kazooie series and takes place between the events of the Nintendo 64 (N64) games Banjo-Kazooie and Banjo-Tooie. In Grunty's Revenge, the evil witch Gruntilda travels back in time to prevent the events of Banjo-Kazooie from happening, and the bear Banjo and his bird friend Kazooie set out to stop her. Grunty's Revenge retains the focus on collecting items and most of the other game mechanics from its predecessors, but is presented in 2D rather than 3D. Aside from the main game, players can also access minigames such as fishing and target shooting.
Rare began to plan Grunty's Revenge in August 1999. At this time, it was titled Grunty's Curse and was planned for release on the Game Boy Color, and featured a different plot. Rare was working on the game's sprites when production halted in late 1999, but it was revived after Nintendo released the GBA. Nintendo rival Microsoft's purchase of Rare in 2002 did not affect their plans to develop the game; Microsoft negotiated a deal with THQ to publish Grunty's Revenge alongside Rare's other GBA projects. The game was released for the GBA in September 2003 and a port for mobile phones was released in June 2005. Grunty's Revenge received average reviews; although its visual style and gameplay were praised and favourably compared to those of the N64 games, its low difficulty and story were criticised.