It is located within the second Game Pak from Spiral Mountain which requires the use of Grenade Eggs and the use of a Flight Pad. Above the stumps, where the Turbo Trainers and Wading Boots are located, is a grate covering a hole in the side of the wall. Use Grenade Eggs to destroy the grating to reveal the hole. Fly to the hole and the Banjo-Kazooie Game Pak can be found running in a circle. This one contains the Bronze Mystery Egg in the Xbox Live Arcade version.