Lots more on Wikipedia here: https://en.m.wikipedia.org/wiki/Perplex_City
This is a puzzle card I thought would either be solved very quickly (within a year or two) or not at all. To have it solved after 14 years is very special.
Perplex City has had a lot of interesting alumni. It was made by Mind Candy, which was founded by Michael Acton Smith, who is also co-founder of Calm. The lead writer was Naomi Alderman, who became an award-winning novelist and whose novel The Power was one of Obama’s top books of the year and is being adapted into a $100m Amazon TV show.
I went on to co-found Six to Start with my brother Dan Hon (who you may know from his popular newsletter, and later left the company to do a lot of good work in the US government digital services realm and Code for America). Six to Start is best known for Zombies, Run!, which is the world’s most popular smartphone fitness game and is sort of like an ARG, if you squint at it.
I continue to do a lot of thinking and writing around ARGs (which are still fascinating) and gamification (which I mostly dislike). My blog post, What ARGs Can Teach Us About QAnon, went somewhat viral a few months ago: https://mssv.net/2020/08/02/what-args-can-teach-us-about-qan...
Edit: That blog post also gets into the confusion between the Perplex City Satoshi and the Bitcoin Satoshi (which conspiratorially-minded people DM me about regularly) along with my supposed involvement in Cicada 3301.