 <unk> with his nephews Huey , Dewey , and Louie , and using the partial map from the library , Donald begins his search in <unk> , with the trail being directed to an Aztec pyramid in Mexico . Outside the pyramid , he is directed by a " sweet <unk> " to obtain a " hero key " from an explorer back in <unk> to open the pyramid . Inside the pyramid , Donald meets Goofy , who gives him a strange note and a plunger to help him reach higher places , and tells him that <unk> <unk> is looking for him back in <unk> . Travelling across the rooftops of <unk> to meet <unk> , Donald is given <unk> 's latest invention , bubblegum ammo that can break through walls . The last location on the partial map is Count Dracula 's castle in Transylvania , where Donald encounters a ghost who tells him that the Count carries the real treasure map . 
