levels will enable Banjo to purchase three additional abilities from a mole named Bozzeye. Eventually, Banjo rescues Kazooie, who rides in his backpack for the remainder of the game. With Kazooie, the player can purchase seven new abilities, such as temporary flight. While Grunty's Revenges game mechanics are largely the same as those from the N64 games, it is presented in 2D from an overhead perspective with pre-rendered graphics, rather than the 3D presentation of its predecessors. There are five levels (called worlds), which are accessed from the overworld Spiral Mountain. In each world, players must collect items scattered around the environments. These include the musical notes; puzzle pieces called Jiggies, which unlock levels and progress players through the game; empty honeycombs, which extend Banjo's energy bar; and lost creatures called Jinjos, which will give the player a Jiggy when every one in a level is found. Progress is tracked on a statistics screen showing maps of each location and collected items. Other collectibles include totems and coins; overall, there are more than 750 collectibles. If Banjo gives totems to Mumbo Jumbo, he will gain the ability to transform into other creatures, including a mouse, octopus, candle, or tank, each with its own unique abilities. Some areas in levels are inaccessible unless Banjo buys new abilities or transformations. Every level features an "arena style" boss fight with Gruntilda or her minion, Klungo. Like previous games, the final boss fight includes game show-style quiz segments testing the player's knowledge of the game mechanics. Aside from the platforming, some levels feature minigames, such as fishing, racing, and target shooting. The closing credits features a minigame where the player can earn tokens, which can be used to purchase and replay unlocked ones in an arcade cabinet hidden in one of the levels. Development Grunty's Revenge was developed by Rare for the Game Boy Advance (GBA), a handheld game console by Nintendo. Production lasted four years and began in August 1999, a year before the release of Banjo-Tooie and when Rare was still a second-party developer for Nintendo. Although it was developed and released on the GBA, Grunty's Revenge was initially planned for the system's predecessor, the Game Boy Color. It was originally titled Banjo-Kazooie: Grunty's Curse and was conceptualised by a small team. Grunty's Curses story was different: it was set in a parallel universe, did not involve time travel, and would have