In Banjo-Kazooie, Grunty kidnaps Banjo's sister, Tooty, and takes her to the lair to put her inside a beauty machine so Grunty can steal her beauty and Tooty can have Grunty's ugliness. But, Banjo and Kazooie make their way through the lair, going through various worlds; Mumbo's Mountain, Treasure Trove Cove, Clanker's Cavern, Bubblegloop Swamp, Freezeezy Peak, Gobi's Valley, Mad Monster Mansion, Rusty Bucket Bay. Banjo and Kazooie must collect musical notes from each world to open the doors sealed by Grunty's spells. Each door has a different number on it, which means that's how many notes it takes to break the spell and open the door. Banjo and Kazooie also have to collect Jigsaw Pieces (also known as Jiggies) to enter a world, by putting the Jiggies in a puzzle. There is a puzzle for each world. Banjo and Kazooie must complete a puzzle to enter the world. Cheato, Gruntilda's spell book is also found in 3 places around the lair, and if found will give Banjo a few cheats. Also, Brentilda Winkybunion, Grunty's nicer sister is found in various places around the lair. She will tell Banjo and Kazooie a few secrets about Grunty each time Banjo and Kazooie find her. In the Grunty's Furnace Fun game, there are a few questions about these secrets. After Banjo and Kazooie pass through the note door that requires 765 notes, Grunty takes Tooty to a game called Grunty's Furnace Fun. It is a quiz game that Banjo and Kazooie must play to rescue Tooty. After they beat the game, Tooty is rescued. But Banjo still has to defeat Grunty. So Banjo has to put together a puzzle of Grunty in order to open a door that leads to Grunty's cauldron, Dingpot. Banjo and Kazooie must jump inside of Dingpot so Dingpot can shoot them up to the top of the lair. Banjo and Kazooie have to fight Grunty. After they do, Grunty falls from the top of her lair and lands in the ground, and is stuck under a huge boulder (which is a piece of the lair that broke and fell).
In Banjo-Tooie, Gruntilda's Lair is only accessible in the entrance area. The door leading to Mumbo's Mountain and the path leading to the first note door are blocked by boulders. The boulders fell when Grunty's sisters, Mingella and Blobbelda come into Spiral Mountain with a giant digging machine called Hag1. Cheato is found in the entrance area, but he says Grunty ripped out all his pages, so he cannot give Banjo and Kazooie any cheats. So Banjo and Kazooie must find the pages. Cheato will give Banjo and Kazooie one cheat for every five pages. Grunty's new lair is Cauldron Keep, where she and her sisters use the Big O' Blaster (B.O.B) to suck life force from people to give to Grunty back her body. The witches take life force from Jingaling, which makes him a zombie. When Banjo and Kazooie come to the lair, Kazooie reverses the action, which brings Jingaling back his life force. Somehow, there was still enough life force stored in the B.O.B. to bring Bottles back to life, when his life force wasn't sucked into the B.O.B., but he was killed by Grunty's electric spell.
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