Banjo-Kazooie: Grunty's Revenge Cheats

To get N.Kreditzs finish the game. In the ending credits you'll be playing a slide minigame in wich you have to get as many coins as you can. When the credits finish load your game again and go to Spillers Harbor, searach in the level for a Arcade machine, you can use the N.Kreditzs there to play mini-games that you finished already.