This reminds me of Cicada 3301.
https://en.wikipedia.org/wiki/Cicada_3301Cicada 3301 is a nickname given to an alleged enigmatic organization that posted three sets of
puzzles online between 2012 and 2014.[url=https://en.wikipedia.org/wiki/Cicada_3301#cite_note-DT-1][1][/url] The first Internet puzzle started on January 4, 2012, on
4chan and ran for nearly a month. A second round began one year later on January 4, 2013, and then a third round following the confirmation of a fresh clue posted on
Twitter on January 4, 2014.[url=https://en.wikipedia.org/wiki/Cicada_3301#cite_note-2][2][/url][url=https://en.wikipedia.org/wiki/Cicada_3301#cite_note-3][3][/url] The third puzzle has yet to be solved. The stated intent was to recruit "intelligent individuals" by presenting a series of puzzles to be solved; no new puzzles were published on January 4, 2015. A new clue was posted on Twitter on January 5, 2016.[url=https://en.wikipedia.org/wiki/Cicada_3301#cite_note-4][4][/url][url=https://en.wikipedia.org/wiki/Cicada_3301#cite_note-5][5][/url] Cicada 3301 posted their last verified
OpenPGP-signed message in April 2017, denying the validity of any unsigned puzzle