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Bill Drill Object
Bill Drill Objects are a type of boulder featured in Banjo-Tooie. As its name suggests, they can only be destroyed from Kazooie using her Bill Drill move. Their purpose is to often obscure an important object, such as a Flight Pad. These objects appear in most worlds, including the hub worlds, except for Witchyworld, Grunty Industries, Hailfire Peaks, and Cauldron Keep.
In Glitter Gulch Mine, Bill Drill Objects often appear on top of a tunnel entrance. They also blend in with the world's rocky terrain, and are possibly harder to notice.