Banjo-Kazooie is comprised of several non-linear 3D worlds in which the player must gather jigsaw pieces, or "Jiggys", to progress. Banjo and Kazooie are aided by Bottles, who teaches them new abilities, and Mumbo, who uses magical powers to transform them into other creatures, such as a termite or crocodile. The player progresses in the game by finding jigsaw pieces (Jiggys), Musical Notes and Mumbo Tokens. Jiggys open doors to new worlds by collecting enough to complete the corresponding jigsaw puzzle. There are ten in each world; nine must be found, and one is granted by finding all five Jinjos on each world. Musical Notes open note doors that allow Banjo and Kazooie to progress further into Gruntilda's lair. There are 100 notes in each world, and 900 total in the game. Mumbo Tokens grant the player magical transformations at Mumbo's hut when the player collects a sufficient amount.