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The Crystal Jiggy is a powerful artifact found in Jiggywiggy's Temple in Banjo-Tooie and Banjo-Kazooie: Grunty's Revenge. It is guarded by Master Jiggywiggy and his disciple. The Crystal Jiggy is composed of some blue crystalline material, and is powered by Jiggies. If Banjo and Kazooie have enough Jiggies, the Crystal Jiggy activates, and it unlocks access to a world.
In Banjo-Tooie, the Crystal Jiggy is activated when Banjo and Kazooie complete one of Jiggywiggy's Challenges. Each puzzle shows a preview of the world that is being unlocked. When activated, the Crystal Jiggy sends out a beam of energy to open the door to that locked world.
Banjo-Kazooie: Grunty's Revenge
In Banjo-Kazooie: Grunty's Revenge, the Crystal Jiggy is flanked by two giant statues of Jiggywiggy. When Banjo and Kazooie have collected enough Jiggies, Master Jiggywiggy gives them a unique type of Jiggy to take to the Crystal Jiggy, activating it and unlocking one of the worlds.