Banjo-Threeie is canceled game in the Rare's famed Banjo-Kazooie franchise. It was planned to release for the GameCube, Xbox, and later Xbox 360, but was cancelled likely due to Rare being purchased by Microsoft in 2002. The game was eventually revived on Microsoft's Xbox 360 as Banjo Kazooie: Nuts and Bolts, and some claim that some elements of Banjo-Threeie could be present in the Gameboy Advance game, Banjo-Kazooie: Grunty's Revenge.
Spaceworld 2000 Tech Demo
The only proof of this game's existence is footage from SpaceWorld 2000 when many upcoming Nintendo GameCube games were shown off for the first time, including Luigi's Mansion, The Legend of Zelda: Twilight Princess, Super Smash Bros. Melee, Donkey Kong Racing, and Banjo-Threeie, which was shown off as a tech-demo.
After the buyout, it is possible that Rare continued work on the game for Xbox. Over the years, fans have uncovered a code for a build called "Banjo X". The code was unbootable, but some character models and text could be found.
In 2006, Rare released a trailer for Banjo-Threeie, where Banjo and Kazooie were told to stay out from behind a door. Banjo uses Kazooie to destroy the door, revealing a massive world or Jiggys, Music Notes, and Honey Comb Pieces. Banjo runs after the world, crashes into the wall, and the trailer ends.
Nuts and Bolts
Rare tried again to make a Banjo game, and eventually released Banjo-Kazooie: Nuts and Bolts for Xbox 360. The game was praised by critics and hated by fans, likely because the game played differently than the previous games.