Late in the game, as it was with GPW2, the player needs to solve a puzzle in order to proceed. In GPW3, this involved looking up the lyrics for songs used in game, and creating a sequence of button presses accordingly.

I want to take a quick detour to mention the insanity that was GPW2's puzzle, which included opening the game in external level-making software on your PC in order to crack the code as well as unmarked hints in the screenshots section of the site where it was uploaded. Some of the coolest stuff ever