Cipher Hunt was an ARG (alternate reality game) about Gravity Falls, created by series creator Alex Hirsch. The goal of the entire game was to find an actual statue of Bill Cipher, briefly glimpsed in the series finale, by retrieving and decoding clues h
but a treasure chest with messages that could only be read under black light. Also, in a truly brilliant bit of fan service, there was a sash and crown inside the chest that would anoint the wearer as the mayor of Gravity Falls!